251351957 has 2 divisors, whose sum is σ = 251351958. Its totient is φ = 251351956.

The previous prime is 251351887. The next prime is 251351959. The reversal of 251351957 is 759153152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205234276 + 46117681 = 14326^2 + 6791^2 .

It is a cyclic number.

It is not a de Polignac number, because 251351957 - 2⁸ = 251351701 is a prime.

Together with 251351959, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251351957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251351959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125675978 + 125675979.

It is an arithmetic number, because the mean of its divisors is an integer number (125675979).

Almost surely, 2^251351957 is an apocalyptic number.

It is an amenable number.

251351957 is a deficient number, since it is larger than the sum of its proper divisors (1).

251351957 is an equidigital number, since it uses as much as digits as its factorization.

251351957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47250, while the sum is 38.

The square root of 251351957 is about 15854.0832910642. The cubic root of 251351957 is about 631.0940568032.

The spelling of 251351957 in words is "two hundred fifty-one million, three hundred fifty-one thousand, nine hundred fifty-seven".