54

This number is a composite.

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The sum of the non-prime divisors of 54 is a Mersenne prime exponent. [Noll]

The 54^th prime is the smallest number that is the sum of three cubes in two ways. [Noll]

The sum of denoninators of the Bernoulli numbers less than or equal to 54 is prime. [Noll]

13⁵⁴ + 54 is prime. [Noll]