251013239 has 2 divisors, whose sum is σ = 251013240. Its totient is φ = 251013238.

The previous prime is 251013173. The next prime is 251013307. The reversal of 251013239 is 932310152.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251013239 is a prime.

It is a super-2 number, since 2×251013239² = 126015292306542242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251013839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125506619 + 125506620.

It is an arithmetic number, because the mean of its divisors is an integer number (125506620).

Almost surely, 2^251013239 is an apocalyptic number.

251013239 is a deficient number, since it is larger than the sum of its proper divisors (1).

251013239 is an equidigital number, since it uses as much as digits as its factorization.

251013239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 251013239 is about 15843.3973313807. The cubic root of 251013239 is about 630.8104451795.

The spelling of 251013239 in words is "two hundred fifty-one million, thirteen thousand, two hundred thirty-nine".