256943169 has 24 divisors (see below), whose sum is σ = 424744320. Its totient is φ = 146622528.

The previous prime is 256943153. The next prime is 256943177. The reversal of 256943169 is 961349652.

It is not a de Polignac number, because 256943169 - 2⁴ = 256943153 is a prime.

It is a super-2 number, since 2×256943169² = 132039584191525122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256943119) 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 23 ways as a sum of consecutive naturals, for example, 51612 + ... + 56370.

It is an arithmetic number, because the mean of its divisors is an integer number (17697680).

Almost surely, 2^256943169 is an apocalyptic number.

It is an amenable number.

256943169 is a deficient number, since it is larger than the sum of its proper divisors (167801151).

256943169 is a wasteful number, since it uses less digits than its factorization.

256943169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5629 (or 5626 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 256943169 is about 16029.4469336905. The cubic root of 256943169 is about 635.7392502373.

The spelling of 256943169 in words is "two hundred fifty-six million, nine hundred forty-three thousand, one hundred sixty-nine".