256631751 has 24 divisors (see below), whose sum is σ = 382702320. Its totient is φ = 165609600.

The previous prime is 256631743. The next prime is 256631761. The reversal of 256631751 is 157136652.

It is not a de Polignac number, because 256631751 - 2³ = 256631743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256631761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45685 + ... + 50993.

It is an arithmetic number, because the mean of its divisors is an integer number (15945930).

Almost surely, 2^256631751 is an apocalyptic number.

256631751 is a deficient number, since it is larger than the sum of its proper divisors (126070569).

256631751 is a wasteful number, since it uses less digits than its factorization.

256631751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5487 (or 5484 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 256631751 is about 16019.7300539054. The cubic root of 256631751 is about 635.4823053710.

The spelling of 256631751 in words is "two hundred fifty-six million, six hundred thirty-one thousand, seven hundred fifty-one".