256207431 has 8 divisors (see below), whose sum is σ = 353389680. Its totient is φ = 164915072.

The previous prime is 256207421. The next prime is 256207439. The reversal of 256207431 is 134702652.

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

It is a cyclic number.

It is not a de Polignac number, because 256207431 - 2⁹ = 256206919 is a prime.

It is a super-2 number, since 2×256207431² = 131284495399239522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256207439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1472370 + ... + 1472543.

It is an arithmetic number, because the mean of its divisors is an integer number (44173710).

Almost surely, 2^256207431 is an apocalyptic number.

256207431 is a deficient number, since it is larger than the sum of its proper divisors (97182249).

256207431 is a wasteful number, since it uses less digits than its factorization.

256207431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2944945.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 256207431 is about 16006.4809061830. The cubic root of 256207431 is about 635.1318725022.

The spelling of 256207431 in words is "two hundred fifty-six million, two hundred seven thousand, four hundred thirty-one".