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1,000,000,000 (one billion, short scale; one thousand million or milliard, yard,〔http://www.investopedia.com/terms/y/yard.asp〕 long scale) is the natural number following 999,999,999 and preceding 1,000,000,001. In scientific notation, it is written as 1 × 109. Previously in British English (but not in American English), the word "billion" referred to a million millions (1,000,000,000,000). However, this is no longer common, and the word has been used to mean one thousand million (1,000,000,000) for some time.〔(【引用サイトリンク】title=How many is a billion? )〕〔https://books.google.com/ngrams/graph?content=billion%2Cthousand+million%2Cmilliard&year_start=1808&year_end=2008&corpus=18&smoothing=3&share=〕 The alternative term "one thousand million" is rare and is used primarily to ease understanding among non-native speakers of English, as many other languages use words similar to "billion" (e.g. Spanish ''billón'', or Finnish ''Biljoona'') to mean one trillion (1,000,000,000,000 or a million millions). In the South Asian numbering system, it is known as 100 crore or 1 Arab. The term ''milliard'' can also be used to refer to 1,000,000,000; whereas "milliard" is seldom used in English, variations on this name often appear in other languages (e.g. Hungarian (Magyar) ''milliárd'', Indonesian ''miliar'', Polish ''miliard'', Danish ''milliard'', Spanish ', French ''milliard'', Italian ''miliardo'', Icelandic ''milljarður'', German ''Milliarde'', Hebrew ''מיליארד'', Finnish ''miljardi'', Dutch ''miljard'', Croatian ''milijarda'', Serbian ''милијарда'', Bulgarian ''милиард'', Russian ''миллиард'', Czech ''miliarda'', Arabic ''مليار'', Romanian ''miliard'', Swedish ''miljard'', Norwegian ''milliard'', Turkish ''milyar'', Esperanto ''miliardo''). The SI prefix giga indicates 1,000,000,000 times the base unit. Despite this, B remains the common abbreviation for this number. See Orders of magnitude (numbers) for larger numbers; and long and short scales. == Selected 10-digit numbers (1,000,000,000–9,999,999,999) == *1000000007 – smallest prime number with 10 digits. *1023456789 – smallest pandigital number in base 10. *1026753849 – smallest pandigital square that includes 0. *1073676287 – 15th Carol number. *1073741824 – 230 *1073807359 – 14th Kynea number. *1129760415 – 23rd Motzkin number. *1134903170 – 45th Fibonacci number. *1162261467 – 319 *1220703125 – 513 *1234567890 – pandigital number with the digits in order. *1311738121 – 25th Pell number. *1382958545 – 15th Bell number. *1406818759 – 30th Wedderburn–Etherington number. *1836311903 – 46th Fibonacci number. *1882341361 – The least prime whose reversal is both square (403912) and triangular (triangular of 57121). *1977326743 – 711 *2147483647 – 8th Mersenne prime and the largest signed 32-bit integer. *2147483648 – 231 *2176782336 – 612 *2214502422 – 6th primary pseudoperfect number. *2357947691 – 119 *2971215073 – 11th Fibonacci prime (47th Fibonacci number). *3166815962 – 26th Pell number. *3192727797 – 24th Motzkin number. *3323236238 – 31st Wedderburn–Etherington number. *3405691582 – hexadecimal CAFEBABE; used as a placeholder in programming. *3405697037 – hexadecimal CAFED00D; used as a placeholder in programming. *3735928559 – hexadecimal DEADBEEF; used as a placeholder in programming. *3486784401 – 320 *4294836223 – 16th Carol number. *4294967291 – Largest prime 32-bit unsigned integer. *4294967295 – Maximum 32-bit unsigned integer (hexadecimal FFFFFFFF). *4294967296 – 232 *4294967297 – the first composite Fermat number. *4295098367 – 15th Kynea number. *4807526976 – 48th Fibonacci number. *5784634181 – 13th alternating factorial. *6103515625 – 514 *6210001000 – only self-descriptive number in base 10. *6227020800 – 13! *6975757441 – 178 *6983776800 – 15th colossally abundant number, 15th superior highly composite number *7645370045 – 27th Pell number. *7778742049 – 49th Fibonacci number. *7862958391 – 32nd Wedderburn–Etherington number. *8589869056 – 6th perfect number. *8589934592 – 233 *9043402501 – 25th Motzkin number. *9814072356 – largest square pandigital number, largest pandigital pure power. *9876543210 – largest number without redundant digits. *9999999967 – greatest prime number with 10 digits.〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「1000000000」の詳細全文を読む スポンサード リンク
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