251074961 has 4 divisors (see below), whose sum is σ = 251310900. Its totient is φ = 250839024.

The previous prime is 251074951. The next prime is 251075009. The reversal of 251074961 is 169470152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49434961 + 201640000 = 7031^2 + 14200^2 .

It is a cyclic number.

It is not a de Polignac number, because 251074961 - 2²² = 246880657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251074951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116366 + ... + 118503.

It is an arithmetic number, because the mean of its divisors is an integer number (62827725).

Almost surely, 2^251074961 is an apocalyptic number.

It is an amenable number.

251074961 is a deficient number, since it is larger than the sum of its proper divisors (235939).

251074961 is a wasteful number, since it uses less digits than its factorization.

251074961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235938.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 251074961 is about 15845.3450893314. The cubic root of 251074961 is about 630.8621445662.

The spelling of 251074961 in words is "two hundred fifty-one million, seventy-four thousand, nine hundred sixty-one".