97

This number is a prime.

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Carla Kik © 2004

There are 97 leap days every four hundred years in the Gregorian calendar. [Poo Sung]

Dudeney numbers are exactly 1³, 8³, 17³, 18³, 26³, 27³. The sum 97 = 1 + 8 + 17 + 18 + 26 + 27 is an emirp. [Poo Sung]