256312769 has 8 divisors (see below), whose sum is σ = 261491328. Its totient is φ = 251177920.

The previous prime is 256312751. The next prime is 256312781. The reversal of 256312769 is 967213652.

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

It is a cyclic number.

It is not a de Polignac number, because 256312769 - 2²⁴ = 239535553 is a prime.

It is a super-2 number, since 2×256312769² = 131392471104894722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (256312729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1049 + ... + 22665.

It is an arithmetic number, because the mean of its divisors is an integer number (32686416).

Almost surely, 2^256312769 is an apocalyptic number.

It is an amenable number.

256312769 is a deficient number, since it is larger than the sum of its proper divisors (5178559).

256312769 is a wasteful number, since it uses less digits than its factorization.

256312769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21855.

The product of its digits is 136080, while the sum is 41.

The square root of 256312769 is about 16009.7710477071. The cubic root of 256312769 is about 635.2189040064.

The spelling of 256312769 in words is "two hundred fifty-six million, three hundred twelve thousand, seven hundred sixty-nine".