256939369 has 2 divisors, whose sum is σ = 256939370. Its totient is φ = 256939368.

The previous prime is 256939349. The next prime is 256939399. The reversal of 256939369 is 963939652.

It is a happy number.

256939369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131790400 + 125148969 = 11480^2 + 11187^2 .

It is a cyclic number.

It is not a de Polignac number, because 256939369 - 2¹³ = 256931177 is a prime.

It is a super-2 number, since 2×256939369² = 132035678684236322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256939349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128469684 + 128469685.

It is an arithmetic number, because the mean of its divisors is an integer number (128469685).

Almost surely, 2^256939369 is an apocalyptic number.

It is an amenable number.

256939369 is a deficient number, since it is larger than the sum of its proper divisors (1).

256939369 is an equidigital number, since it uses as much as digits as its factorization.

256939369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2361960, while the sum is 52.

The square root of 256939369 is about 16029.3284014022. The cubic root of 256939369 is about 635.7361161836.

The spelling of 256939369 in words is "two hundred fifty-six million, nine hundred thirty-nine thousand, three hundred sixty-nine".