256159569 has 4 divisors (see below), whose sum is σ = 341546096. Its totient is φ = 170773044.

The previous prime is 256159567. The next prime is 256159583. The reversal of 256159569 is 965951652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 256159569 - 2¹ = 256159567 is a prime.

It is a super-2 number, since 2×256159569² = 131235449580531522, 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 (256159567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42693259 + ... + 42693264.

It is an arithmetic number, because the mean of its divisors is an integer number (85386524).

Almost surely, 2^256159569 is an apocalyptic number.

It is an amenable number.

256159569 is a deficient number, since it is larger than the sum of its proper divisors (85386527).

256159569 is an equidigital number, since it uses as much as digits as its factorization.

256159569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85386526.

The product of its digits is 729000, while the sum is 48.

The square root of 256159569 is about 16004.9857544454. The cubic root of 256159569 is about 635.0923204685.

The spelling of 256159569 in words is "two hundred fifty-six million, one hundred fifty-nine thousand, five hundred sixty-nine".