53

This number is a prime.

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π(3⁵) = 53. [Firoozbakht]

1000^53 - 53 is prime. Note that 53 is the smallest number with this property. [Firoozbakht]

53 = prime( prime(5) + prime(3) ). Note that 53 is the only number with this property. [Firoozbakht]

53 = prime(5*3) + π(5*3). It is the only known prime with this property. [Firoozbakht]

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