256593679 has 2 divisors, whose sum is σ = 256593680. Its totient is φ = 256593678.

The previous prime is 256593677. The next prime is 256593697. The reversal of 256593679 is 976395652.

Together with next prime (256593697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256593679 - 2¹ = 256593677 is a prime.

It is a super-2 number, since 2×256593679² = 131680632205510082, which contains 22 as substring.

Together with 256593677, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256593677) 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, 128296839 + 128296840.

It is an arithmetic number, because the mean of its divisors is an integer number (128296840).

Almost surely, 2^256593679 is an apocalyptic number.

256593679 is a deficient number, since it is larger than the sum of its proper divisors (1).

256593679 is an equidigital number, since it uses as much as digits as its factorization.

256593679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3061800, while the sum is 52.

The square root of 256593679 is about 16018.5417251384. The cubic root of 256593679 is about 635.4508786558.

The spelling of 256593679 in words is "two hundred fifty-six million, five hundred ninety-three thousand, six hundred seventy-nine".