256459689 has 10 divisors (see below), whose sum is σ = 383106570. Its totient is φ = 170973072.

The previous prime is 256459661. The next prime is 256459699. The reversal of 256459689 is 986954652.

It is a happy number.

256459689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 237406464 + 19053225 = 15408^2 + 4365^2 .

It is not a de Polignac number, because 256459689 - 2¹² = 256455593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256459699) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1583004 + ... + 1583165.

It is an arithmetic number, because the mean of its divisors is an integer number (38310657).

Almost surely, 2^256459689 is an apocalyptic number.

It is an amenable number.

256459689 is a deficient number, since it is larger than the sum of its proper divisors (126646881).

256459689 is an equidigital number, since it uses as much as digits as its factorization.

256459689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3166181 (or 3166172 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 54.

The square root of 256459689 is about 16014.3588382426. The cubic root of 256459689 is about 635.3402512386.

The spelling of 256459689 in words is "two hundred fifty-six million, four hundred fifty-nine thousand, six hundred eighty-nine".