256853731 has 8 divisors (see below), whose sum is σ = 277750080. Its totient is φ = 236600448.

The previous prime is 256853713. The next prime is 256853771. The reversal of 256853731 is 137358652.

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 256853731 - 2¹⁹ = 256329443 is a prime.

It is a super-2 number, since 2×256853731² = 131947678257240722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256853711) 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, 159936 + ... + 161533.

It is an arithmetic number, because the mean of its divisors is an integer number (34718760).

Almost surely, 2^256853731 is an apocalyptic number.

256853731 is a deficient number, since it is larger than the sum of its proper divisors (20896349).

256853731 is a wasteful number, since it uses less digits than its factorization.

256853731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321533.

The product of its digits is 151200, while the sum is 40.

The square root of 256853731 is about 16026.6568878229. The cubic root of 256853731 is about 635.6654779633.

The spelling of 256853731 in words is "two hundred fifty-six million, eight hundred fifty-three thousand, seven hundred thirty-one".