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The number 1289 (twelve hundred eighty-nine) is the natural number following 1288 and preceding 1290.〔 "Number Gossip: 1289", March 2008, webpage: (Numbergossip-1289 ). 〕 ==In mathematics== The number 1289 is an odd prime number, following 1283 and preceding 1291.〔 It is classified as an apocalyptic power, a deficient number, and an evil number: 〔 * The number 1289 is called an apocalyptic power because 21289 contains the consecutive digits 666 (in decimal), as the Number of the Beast: in the sequence ..., 1281, 1285, 1286, 1289, 1290, 1298, 1301, etc.〔〔 "Apocalyptic Number -- from Wolfram MathWorld", Mathworld.Wolfram.com, August 2010, webpage: (MW-Apoc ). 〕 * The number 1289 is classed as a deficient number because the sum of all its positive divisors (except itself) totals less than 1289.〔 Compare with perfect and abundant numbers. * The number 1289 is classed as an evil number because it has an even number of 1's contained in its binary expansion.〔 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「1289 (number)」の詳細全文を読む スポンサード リンク
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