256593839 has 2 divisors, whose sum is σ = 256593840. Its totient is φ = 256593838.

The previous prime is 256593797. The next prime is 256593859. The reversal of 256593839 is 938395652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256593839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256593859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128296919 + 128296920.

It is an arithmetic number, because the mean of its divisors is an integer number (128296920).

Almost surely, 2^256593839 is an apocalyptic number.

256593839 is a deficient number, since it is larger than the sum of its proper divisors (1).

256593839 is an equidigital number, since it uses as much as digits as its factorization.

256593839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1749600, while the sum is 50.

The square root of 256593839 is about 16018.5467193500. The cubic root of 256593839 is about 635.4510107350.

The spelling of 256593839 in words is "two hundred fifty-six million, five hundred ninety-three thousand, eight hundred thirty-nine".