239

This number is a prime.

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The reversal of the 239th prime number (1499) is the 239th emirp (9941). [Gaydos]

The 52nd prime number (239) has a Collatz trajectory length of 52. [Gaydos]

The smallest integer greater than 1 that has the same Collatz trajectory length (52) as its square (57121). [Gaydos]

None of the 239 consecutive primes from 77132821 to 77137121 has the same sum of digits as the prime before it or the prime after it. [Gaydos]