# 2

This number is a prime.

Just showing those entries submitted by 'Firoozbakht': (Click here to show all)

The only prime p such that p times reversal(p) - 1 is prime. [Firoozbakht]

The only known number *n* such that the sum of the proper divisors of *n* is equal to phi(*n*). [Firoozbakht]

Only prime whose sum of divisors is prime. [Firoozbakht]

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