9631

This number is a prime.

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The larger of only two 4-digit primes (emirps) p such that 10^100+p is prime. [Loungrides]

The largest 4-digit distinct-digit prime that yields another when each digit d is repeated d times, i.e., 9999999996666663331. [Loungrides]

The largest 4-digit prime whose the reversal is the square of an emirp, i.e., 1369=37^2. [Loungrides]