256813469 has 8 divisors (see below), whose sum is σ = 292341312. Its totient is φ = 223315840.

The previous prime is 256813439. The next prime is 256813471. The reversal of 256813469 is 964318652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256813469 - 2²⁰ = 255764893 is a prime.

It is a super-2 number, since 2×256813469² = 131906315719627922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256813439) 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, 507284 + ... + 507789.

It is an arithmetic number, because the mean of its divisors is an integer number (36542664).

Almost surely, 2^256813469 is an apocalyptic number.

It is an amenable number.

256813469 is a deficient number, since it is larger than the sum of its proper divisors (35527843).

256813469 is a wasteful number, since it uses less digits than its factorization.

256813469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015107.

The product of its digits is 311040, while the sum is 44.

The square root of 256813469 is about 16025.4007438192. The cubic root of 256813469 is about 635.6322625599.

The spelling of 256813469 in words is "two hundred fifty-six million, eight hundred thirteen thousand, four hundred sixty-nine".