256239077 has 2 divisors, whose sum is σ = 256239078. Its totient is φ = 256239076.

The previous prime is 256239019. The next prime is 256239083. The reversal of 256239077 is 770932652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136095556 + 120143521 = 11666^2 + 10961^2 .

It is a cyclic number.

It is not a de Polignac number, because 256239077 - 2⁸ = 256238821 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256239007) 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, 128119538 + 128119539.

It is an arithmetic number, because the mean of its divisors is an integer number (128119539).

Almost surely, 2^256239077 is an apocalyptic number.

It is an amenable number.

256239077 is a deficient number, since it is larger than the sum of its proper divisors (1).

256239077 is an equidigital number, since it uses as much as digits as its factorization.

256239077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 158760, while the sum is 41.

The square root of 256239077 is about 16007.4694127460. The cubic root of 256239077 is about 635.1580213089.

The spelling of 256239077 in words is "two hundred fifty-six million, two hundred thirty-nine thousand, seventy-seven".