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97 (ninety-seven) is the natural number following 96 and preceding 98. ==In mathematics== 97 is the 25th prime number (the largest two-digit prime number in base 10), following 89 and preceding 101. 97 is a Proth prime as it is 3 × 25 + 1. The numbers 97, 907, 9007, 90007 and 900007 are happy primes. However, 9000007 (read as ''nine million seven'') is composite and has the factorisation 277 × 32491. 97 is the tenth member of the Mian–Chowla sequence. 97 is the smallest factor of one more than the product of the first twenty-five terms of the Euclid–Mullin sequence, making it the twenty-sixth term. Since there is no integer that added to its own digits adds up to 97, 97 is a self number in base 10. 97 is the highest two digit number where the sum of its digits is a square. 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「97 (number)」の詳細全文を読む スポンサード リンク
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