256215169 has 16 divisors (see below), whose sum is σ = 303280000. Its totient is φ = 216315792.

The previous prime is 256215163. The next prime is 256215233. The reversal of 256215169 is 961512652.

It is not a de Polignac number, because 256215169 - 2³ = 256215161 is a prime.

It is a super-2 number, since 2×256215169² = 131292425651397122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256215161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17407 + ... + 28555.

It is an arithmetic number, because the mean of its divisors is an integer number (18955000).

Almost surely, 2^256215169 is an apocalyptic number.

It is an amenable number.

256215169 is a deficient number, since it is larger than the sum of its proper divisors (47064831).

256215169 is an equidigital number, since it uses as much as digits as its factorization.

256215169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11237 (or 11223 counting only the distinct ones).

The product of its digits is 32400, while the sum is 37.

The square root of 256215169 is about 16006.7226189498. The cubic root of 256215169 is about 635.1382665412.

The spelling of 256215169 in words is "two hundred fifty-six million, two hundred fifteen thousand, one hundred sixty-nine".