9797

9797 = 97 x 101. It is the product of two consecutive primes.

The square root of 9797 includes the digits 9797 immediately to the right of the decimal point: 98.979795918 . . .

9797 has two representations as a sum of two squares: 9797 = 31² + 94² = 49² + 86².

9797 is the hypotenuse of two primitive Pythagorean triples: 9797² = 4995² + 8428² = 5828² + 7875².

9797 is a divisor of 91¹² - 1.

The sum of the digits of 9797 is eight times the number of digits: 9 + 7 + 9 + 7 = 8 x 4 = 32.

9797 is IBM in base 23.

Source: What's Special About This Number?