37

This number is a prime.

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The only known number n such that the reversal of n^prime(n) is prime. [Firoozbakht]

The smallest emirp p such that reversal(p^2) is prime. [Firoozbakht]

The smallest emirp p such that reversal(p + reversal(p)) is prime. [Firoozbakht]

2! + 3! + 5! + ... + 29! = 31 (mod 37). It is the largest known prime with this property and there exists only one other such prime. [Firoozbakht]

37 = prime(|prime(3) - prime(7)|). It is the smallest prime with this property. [Firoozbakht]

The smallest emirp p such that prime(p) is emirp. [Firoozbakht]

The reversal of '37 to the power 37th prime' is prime. It is the only known number with this property. [Firoozbakht]