256532569 has 2 divisors, whose sum is σ = 256532570. Its totient is φ = 256532568.

The previous prime is 256532543. The next prime is 256532603. The reversal of 256532569 is 965235652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230675344 + 25857225 = 15188^2 + 5085^2 .

It is a cyclic number.

It is not a de Polignac number, because 256532569 - 2⁵ = 256532537 is a prime.

It is a super-2 number, since 2×256532569² = 131617917915479522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256532519) 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 as a sum of consecutive naturals, namely, 128266284 + 128266285.

It is an arithmetic number, because the mean of its divisors is an integer number (128266285).

Almost surely, 2^256532569 is an apocalyptic number.

It is an amenable number.

256532569 is a deficient number, since it is larger than the sum of its proper divisors (1).

256532569 is an equidigital number, since it uses as much as digits as its factorization.

256532569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486000, while the sum is 43.

The square root of 256532569 is about 16016.6341345490. The cubic root of 256532569 is about 635.4004286128.

The spelling of 256532569 in words is "two hundred fifty-six million, five hundred thirty-two thousand, five hundred sixty-nine".