256675321 has 4 divisors (see below), whose sum is σ = 293343232. Its totient is φ = 220007412.

The previous prime is 256675303. The next prime is 256675357. The reversal of 256675321 is 123576652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256675321 - 2¹⁵ = 256642553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256645321) 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 3 ways as a sum of consecutive naturals, for example, 18333945 + ... + 18333958.

It is an arithmetic number, because the mean of its divisors is an integer number (73335808).

Almost surely, 2^256675321 is an apocalyptic number.

It is an amenable number.

256675321 is a deficient number, since it is larger than the sum of its proper divisors (36667911).

256675321 is an equidigital number, since it uses as much as digits as its factorization.

256675321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36667910.

The product of its digits is 75600, while the sum is 37.

The square root of 256675321 is about 16021.0898817777. The cubic root of 256675321 is about 635.5182666230.

The spelling of 256675321 in words is "two hundred fifty-six million, six hundred seventy-five thousand, three hundred twenty-one".