16001

This number is a prime.

+ The only prime (bemirp) p of the form p = a^b*c^d+1, where a, b, c, d are the prime digits, i.e., 2^7*5^3+1 = 16001. [Loungrides]

+ The smaller of only two 5-digit ZIP Codes that are bemirps. It belongs to Butler, PA. (You can find the other location by inverting 16001, then reading it backwards.)

+ The smallest bemirp de Polignac number. (A de Polygnac number is an odd number n that cannot be expressed as n = 2^k+p, where p is prime). [Loungrides]

(There is one curio for this number that has not yet been approved by an editor.)

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