256430331 has 12 divisors (see below), whose sum is σ = 370776120. Its totient is φ = 170779680.

The previous prime is 256430311. The next prime is 256430333. The reversal of 256430331 is 133034652.

It is a happy number.

It is not a de Polignac number, because 256430331 - 2¹¹ = 256428283 is a prime.

It is a super-2 number, since 2×256430331² = 131513029313539122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256430295 and 256430304.

It is not an unprimeable number, because it can be changed into a prime (256430333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4810 + ... + 23151.

It is an arithmetic number, because the mean of its divisors is an integer number (30898010).

Almost surely, 2^256430331 is an apocalyptic number.

256430331 is a deficient number, since it is larger than the sum of its proper divisors (114345789).

256430331 is a wasteful number, since it uses less digits than its factorization.

256430331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28986 (or 28983 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 256430331 is about 16013.4421971043. The cubic root of 256430331 is about 635.3160069724.

Adding to 256430331 its reverse (133034652), we get a palindrome (389464983).

The spelling of 256430331 in words is "two hundred fifty-six million, four hundred thirty thousand, three hundred thirty-one".