17

This number is a prime.

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Prime Numbers CD Image J. Neptune © 1994

The only known prime that is equal to the sum of digits of its cube (17³ = 4913 and 4 + 9 + 1 + 3 = 17). [Gupta]

The smallest prime formed from concatenation of happy numbers. [Gupta]

17 is the smallest prime sandwiched between two non-squarefree numbers. A number is squarefree if it is not divisible by the square of an integer greater than 1. [Gupta]

!17 - 1 is prime. Note that !17 represents subfactorial 17. [Gupta]

!17 is the smallest subfactorial containing all digits from 0 to 9, i.e., pandigital. [Gupta]

The sum of all prime digits. [Gupta]

Position 17 in the decimal expansion of both π and e contains the same prime digit. [Gupta]