この項目「1000000000」は途中まで翻訳されたものです。（原文：en:1,000,000,000 12:01, 8 January 2023 (UTC)
）999999999 ← 1000000000 → 1000000001
素因数分解29×59
二進法111011100110101100101000000000
三進法2120200200021010001
四進法323212230220000
五進法4022000000000
六進法243121245344
七進法33531600616
八進法7346545000
十二進法23AA93854
十六進法3B9ACA00
二十進法FCA0000
二十四進法55E1N2G
三十六進法GJDGXS
ローマ数字N/A
漢数字十億
大字拾億
算木
1000000000（十億、じゅうおく、one billion, one thousand million? one milliard, one yard[1]）は、自然数であり、999999999の次の数で1000000001の前の数である。英語ではone billion（ワン・ビリオン）あるいはbillionと表される。billionはbn[2][3]と略されることもある。
標準形式では1 × 109と表記される。SI接頭語のギガは基礎単位の十億倍を表し、記号はGである。
十億年は、天文学や地質学でアイオーンと呼ばれることがある。
イギリス英語（アメリカ英語ではなく）では、billionはもっぱら1,000,000,000,000（一兆）を表すが、もはや、ありふれたものではなく、この数十年で1,000,000,000という意味で使われるようになっている[4]。
milliardという単語もまた、1,000,000,000を表す単語として使われ得る。英語ではめったに使われないが[5]、この単語のバリエーションが他の言語でよく見られる。
インドの命数法では、100カロール（crore）または1アラブ（arab）として知られている。
1000000000は1000の立方数でもある。Visualization of powers of ten from one to 1 billion A is a cube; B consists of 1000 cubes the size of cube A, C consists of 1000 cubes the size of cube B; and D consists of 1000 cubes the size of cube C. Thus there are 1 million A-sized cubes in C; and 1,000,000,000 A-sized cubes in D.
大きさの感覚
時間
十億秒は11,574日1時間46分40秒である。（約31.7年。）
十億分（およそ1901年）前は、ローマ帝国が繁栄し、キリスト教が発展していた。
About 109 hours ago, modern human beings and their ancestors were living in the Stone Age (more precisely, the Middle Paleolithic). (109 hours is roughly 114,080 years.)
About 109 days ago, Australopithecus, an ape-like creature related to an ancestor of modern humans, roamed the African savannas. (109 days is roughly 2.738 million years.)
About 109 months ago, dinosaurs walked the Earth during the late Cretaceous. (109 months is roughly 83.3 million years.)
About 109 years?a gigaannus?ago, the first multicellular eukaryotes appeared on Earth.
About 109 decades ago, galaxies began to appear in the early Universe which was then 3.772 billion years old. (109 decades is exactly 10 billion years.)
The universe is thought to be about 13.77 × 109 years old.[6]
距離
109 inches is 15,783マイル (25,400 km), more than halfway around the world and thus sufficient to reach any point on the globe from any other point.
109 metres (called a gigametre) is almost three times the distance from the Earth to the Moon.
109 kilometres (called a terametre) is over six times the distance from the Earth to the Sun.
面積
A billion square inches could make a square about one half mile on a side.
A bolt of finely woven 1000-TC bed sheet linen with a billion thread crossings would have an area of 40平方メートル (48 sq yd), comparable to the floor area of a motel unit.
体積
There are one billion cubic millimetres in a cubic metre, and a billion cubic metres in a cubic kilometre.
A billion grains of table salt or granulated sugar would occupy a volume of about 2.5立方フィート (0.071 m3).
A billion cubic inches would be a volume comparable to a large commercial building slightly larger than a typical supermarket.
質量
Any object that weighs one billionキログラム (2.2×109 lb) would weigh about as much as 5,525 empty Boeing 747-400s.
A cube of iron that weighs one billionポンド (450,000,000 kg) would be 38.62メートル (126.7 ft) on each side.
製品
As of July 2016, Apple has sold one billion iPhones.[7] This makes the iPhone one of the most successful product lines in history, surpassing the PlayStation and the Rubik's Cube.
As of July 2016, Facebook has 1.71 billion users.[8]
自然
A small mountain, slightly larger than Stone Mountain in Georgia, United States, would weigh (have a mass of) a billion tons.
There are billions of worker ants in the largest ant colony in the world,[9] which covers almost 4,000マイル (6,400 km) of the Mediterranean coast.
In 1804, the world population was one billion.
計算
^ “figures”. The Economist Style Guide (11th ed.). The Economist. (2015). .mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation.cs-ja1 q,.mw-parser-output .citation.cs-ja2 q{quotes:"「""」""『""』"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free a,.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited a,.mw-parser-output .id-lock-registration a,.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription a,.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:#d33}.mw-parser-output .cs1-visible-error{color:#d33}.mw-parser-output .cs1-maint{display:none;color:#3a3;margin-left:0.3em}.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}ISBN 9781782830917. https://books.google.com/books?id=enIZBwAAQBAJ&pg=PT70
^ “6.5 Abbreviating ‘million’ and ‘billion’”. English Style Guide: A handbook for authors and translators in the European Commission (8th ed.). European Commission. (3 November 2017). p. 32. https://ec.europa.eu/info/sites/info/files/styleguide_english_dgt_en.pdf
^ “How many is a billion?”. OxfordDictionaries.com. 2017年1月12日時点のオリジナルよりアーカイブ。
