1277

This number is a prime.

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The smallest prime formed by concatenating n double Mersenne primes (7, 127). Note that 7127 is also a prime. [Loungrides]

The smallest prime whose reversal of square is a Cyclops prime, i.e., 1277^2 = 1630729 with reversal 9270361 that is prime. [Loungrides]

(1277, 1279) is the first case of a twin prime pair (p, p+2) such that 2^p and 2^(p+2) are both "apocalyptic numbers". [Loungrides]