256580331 has 8 divisors (see below), whose sum is σ = 390979584. Its totient is φ = 146617320.

The previous prime is 256580293. The next prime is 256580339. The reversal of 256580331 is 133085652.

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

It is not a de Polignac number, because 256580331 - 2⁶ = 256580267 is a prime.

It is a super-2 number, since 2×256580331² = 131666932512139122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256580292 and 256580301.

It is not an unprimeable number, because it can be changed into a prime (256580339) 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, 6109035 + ... + 6109076.

It is an arithmetic number, because the mean of its divisors is an integer number (48872448).

Almost surely, 2^256580331 is an apocalyptic number.

256580331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

256580331 is a deficient number, since it is larger than the sum of its proper divisors (134399253).

256580331 is a wasteful number, since it uses less digits than its factorization.

256580331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12218121.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 256580331 is about 16018.1250775489. The cubic root of 256580331 is about 635.4398597491.

The spelling of 256580331 in words is "two hundred fifty-six million, five hundred eighty thousand, three hundred thirty-one".