251312553 has 12 divisors (see below), whose sum is σ = 365867008. Its totient is φ = 166221720.

The previous prime is 251312549. The next prime is 251312557. The reversal of 251312553 is 355213152.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (251312549) and next prime (251312557).

It is not a de Polignac number, because 251312553 - 2² = 251312549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251312557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108793 + ... + 111078.

Almost surely, 2^251312553 is an apocalyptic number.

It is an amenable number.

251312553 is a deficient number, since it is larger than the sum of its proper divisors (114554455).

251312553 is a wasteful number, since it uses less digits than its factorization.

251312553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220004 (or 220001 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 251312553 is about 15852.8405341125. The cubic root of 251312553 is about 631.0610765814.

The spelling of 251312553 in words is "two hundred fifty-one million, three hundred twelve thousand, five hundred fifty-three".