1609

This number is a prime.

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(1609, 1613) is the first case of a 4-digit cousin prime pair (p, q) such that p^2+q^3 -/+ 1 is a twin prime pair, i.e., 1609^2+1613^3-1= 4199242277 and 1609^2+1613^3+1= 4199242279 are both prime. [Loungrides]

The only prime whose reversal is a 2-sphenic number, i.e., 9061 = 13 x 17 x 41. [Loungrides]