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 are a square.
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