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1289 (number)
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1289 (number) : ウィキペディア英語版
1289 (number)

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)
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