256231039 has 4 divisors (see below), whose sum is σ = 256408120. Its totient is φ = 256053960.

The previous prime is 256231033. The next prime is 256231067. The reversal of 256231039 is 930132652.

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

It is a cyclic number.

It is not a de Polignac number, because 256231039 - 2¹⁷ = 256099967 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256231039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256231033) 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, 86352 + ... + 89269.

It is an arithmetic number, because the mean of its divisors is an integer number (64102030).

Almost surely, 2^256231039 is an apocalyptic number.

256231039 is a deficient number, since it is larger than the sum of its proper divisors (177081).

256231039 is a wasteful number, since it uses less digits than its factorization.

256231039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177080.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 256231039 is about 16007.2183404863. The cubic root of 256231039 is about 635.1513797854.

It can be divided in two parts, 25623 and 1039, that added together give a palindrome (26662).

The spelling of 256231039 in words is "two hundred fifty-six million, two hundred thirty-one thousand, thirty-nine".