97

This number is a prime.

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Carla Kik © 2004

97 = reversal(9*7 + 9+7) is the only prime with this property. [Firoozbakht]

97 = π(π(9)^π(9) + π(7)^π(7)). Note that the prime 97 is the only integer with this property. [Firoozbakht]

The smallest emirp p such that the reversal of all the five numbers 2^k*p, k < 6 are prime. [Firoozbakht]