256791677 has 2 divisors, whose sum is σ = 256791678. Its totient is φ = 256791676.

The previous prime is 256791673. The next prime is 256791697. The reversal of 256791677 is 776197652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179720836 + 77070841 = 13406^2 + 8779^2 .

It is a cyclic number.

It is not a de Polignac number, because 256791677 - 2² = 256791673 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 (256791673) 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, 128395838 + 128395839.

It is an arithmetic number, because the mean of its divisors is an integer number (128395839).

Almost surely, 2^256791677 is an apocalyptic number.

It is an amenable number.

256791677 is a deficient number, since it is larger than the sum of its proper divisors (1).

256791677 is an equidigital number, since it uses as much as digits as its factorization.

256791677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1111320, while the sum is 50.

The square root of 256791677 is about 16024.7208088004. The cubic root of 256791677 is about 635.6142831160.

The spelling of 256791677 in words is "two hundred fifty-six million, seven hundred ninety-one thousand, six hundred seventy-seven".