23

This number is a prime.

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Kristen Eller ©2002

23⁰ + 23¹ + 23² + 23³ + 23⁵ = 6449063 and the sum of 6 + 4 + 4 + 9 + 0 + 6 + 3 can be written as 3 * 2 + 2 * 2 + 2 * 2 + 3 * 3 + 0 + 3 * 2 + 3 = 32, the reversal of 23. [Gevisier]