256823929 has 2 divisors, whose sum is σ = 256823930. Its totient is φ = 256823928.

The previous prime is 256823923. The next prime is 256824013. The reversal of 256823929 is 929328652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243516025 + 13307904 = 15605^2 + 3648^2 .

It is a cyclic number.

It is not a de Polignac number, because 256823929 - 2³ = 256823921 is a prime.

It is not a weakly prime, because it can be changed into another prime (256823921) 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 as a sum of consecutive naturals, namely, 128411964 + 128411965.

It is an arithmetic number, because the mean of its divisors is an integer number (128411965).

Almost surely, 2^256823929 is an apocalyptic number.

It is an amenable number.

256823929 is a deficient number, since it is larger than the sum of its proper divisors (1).

256823929 is an equidigital number, since it uses as much as digits as its factorization.

256823929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 46.

The square root of 256823929 is about 16025.7270973894. The cubic root of 256823929 is about 635.6408921997.

It can be divided in two parts, 256823 and 929, that added together give a palindrome (257752).

The spelling of 256823929 in words is "two hundred fifty-six million, eight hundred twenty-three thousand, nine hundred twenty-nine".