256231031 has 8 divisors (see below), whose sum is σ = 300750240. Its totient is φ = 213690528.

The previous prime is 256230973. The next prime is 256231033. The reversal of 256231031 is 130132652.

256231031 = 1464² + 1465² + ... + 1574².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256231031 is a prime.

It is a super-2 number, since 2×256231031² = 131308682494645922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256230988 and 256231006.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 494396 + ... + 494913.

It is an arithmetic number, because the mean of its divisors is an integer number (37593780).

Almost surely, 2^256231031 is an apocalyptic number.

256231031 is a deficient number, since it is larger than the sum of its proper divisors (44519209).

256231031 is an equidigital number, since it uses as much as digits as its factorization.

256231031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989353.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 256231031 is about 16007.2180905990. The cubic root of 256231031 is about 635.1513731752.

Adding to 256231031 its reverse (130132652), we get a palindrome (386363683).

The spelling of 256231031 in words is "two hundred fifty-six million, two hundred thirty-one thousand, thirty-one".