256078913 has 2 divisors, whose sum is σ = 256078914. Its totient is φ = 256078912.

The previous prime is 256078877. The next prime is 256078943. The reversal of 256078913 is 319870652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192987664 + 63091249 = 13892^2 + 7943^2 .

It is a cyclic number.

It is not a de Polignac number, because 256078913 - 2⁸ = 256078657 is a prime.

It is not a weakly prime, because it can be changed into another prime (256078943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128039456 + 128039457.

It is an arithmetic number, because the mean of its divisors is an integer number (128039457).

Almost surely, 2^256078913 is an apocalyptic number.

It is an amenable number.

256078913 is a deficient number, since it is larger than the sum of its proper divisors (1).

256078913 is an equidigital number, since it uses as much as digits as its factorization.

256078913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 256078913 is about 16002.4658412383. The cubic root of 256078913 is about 635.0256570946.

The spelling of 256078913 in words is "two hundred fifty-six million, seventy-eight thousand, nine hundred thirteen".