79

This number is a prime.

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An emirp and sum of three reversible primes: 79 = 11 + 31 + 37. Curiously, the sum holds for the reversals: 97 = 11 + 13 + 73. [Silva]

The smallest prime which is arithmetic average of the two previous and two next primes. [Silva]

Subtract 79 from 7!+9! and you will have another emirp. [Silva]

The smallest emirp whose reversal is the next emirp after it. [Silva]

Emirp 79 is the sum of three consecutive odd semiprimes(21+25+33). The reverse emirp is the sum of their reversals. [Silva]

Equal to 3*1+4*1+5*9+2*6+5*3. Can you see the first ten digits of the decimal expansion of π in order? [Silva]