251461457 has 4 divisors (see below), whose sum is σ = 270804660. Its totient is φ = 232118256.

The previous prime is 251461451. The next prime is 251461471. The reversal of 251461457 is 754164152.

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 45711121 + 205750336 = 6761^2 + 14344^2 .

It is a cyclic number.

It is not a de Polignac number, because 251461457 - 2¹⁸ = 251199313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251461451) 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, 9671582 + ... + 9671607.

It is an arithmetic number, because the mean of its divisors is an integer number (67701165).

Almost surely, 2^251461457 is an apocalyptic number.

It is an amenable number.

251461457 is a deficient number, since it is larger than the sum of its proper divisors (19343203).

251461457 is a wasteful number, since it uses less digits than its factorization.

251461457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19343202.

The product of its digits is 33600, while the sum is 35.

The square root of 251461457 is about 15857.5362840512. The cubic root of 251461457 is about 631.1856876349.

The spelling of 251461457 in words is "two hundred fifty-one million, four hundred sixty-one thousand, four hundred fifty-seven".