257

This number is a prime.

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257^100 is the smallest 100th power whose reversal is prime. [Gaydos]

The 257th, 258th, and 259th centuries are the smallest three consecutive centuries to have no years that are powers of other numbers, i.e., no squares, cubes, 4th powers, etc. [Gaydos]

1068349 is the smallest positive integer that together with its smallest prime factor (257) is pandigital. [Gaydos]