256532331 has 16 divisors (see below), whose sum is σ = 374048640. Its totient is φ = 155094720.

The previous prime is 256532321. The next prime is 256532351. The reversal of 256532331 is 133235652.

It is not a de Polignac number, because 256532331 - 2⁵ = 256532299 is a prime.

It is a super-2 number, since 2×256532331² = 131617673696587122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256532321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4551 + ... + 23103.

It is an arithmetic number, because the mean of its divisors is an integer number (23378040).

Almost surely, 2^256532331 is an apocalyptic number.

256532331 is a deficient number, since it is larger than the sum of its proper divisors (117516309).

256532331 is a wasteful number, since it uses less digits than its factorization.

256532331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18986.

The product of its digits is 16200, while the sum is 30.

The square root of 256532331 is about 16016.6267047715. The cubic root of 256532331 is about 635.4002321136.

Adding to 256532331 its reverse (133235652), we get a palindrome (389767983).

It can be divided in two parts, 25 and 6532331, that added together give a palindrome (6532356).

The spelling of 256532331 in words is "two hundred fifty-six million, five hundred thirty-two thousand, three hundred thirty-one".