256575381 has 8 divisors (see below), whose sum is σ = 344598144. Its totient is φ = 169801440.

The previous prime is 256575337. The next prime is 256575391. The reversal of 256575381 is 183575652.

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

It is not a de Polignac number, because 256575381 - 2⁶ = 256575317 is a prime.

It is a super-2 number, since 2×256575381² = 131661852270590322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256575301) 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, 311725 + ... + 312546.

It is an arithmetic number, because the mean of its divisors is an integer number (43074768).

Almost surely, 2^256575381 is an apocalyptic number.

It is an amenable number.

256575381 is a deficient number, since it is larger than the sum of its proper divisors (88022763).

256575381 is a wasteful number, since it uses less digits than its factorization.

256575381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624411.

The product of its digits is 252000, while the sum is 42.

The square root of 256575381 is about 16017.9705643380. The cubic root of 256575381 is about 635.4357733777.

The spelling of 256575381 in words is "two hundred fifty-six million, five hundred seventy-five thousand, three hundred eighty-one".