256375013 has 2 divisors, whose sum is σ = 256375014. Its totient is φ = 256375012.

The previous prime is 256374973. The next prime is 256375019. The reversal of 256375013 is 310573652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 244828609 + 11546404 = 15647^2 + 3398^2 .

It is a cyclic number.

It is not a de Polignac number, because 256375013 - 2⁸ = 256374757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256375019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128187506 + 128187507.

It is an arithmetic number, because the mean of its divisors is an integer number (128187507).

Almost surely, 2^256375013 is an apocalyptic number.

It is an amenable number.

256375013 is a deficient number, since it is larger than the sum of its proper divisors (1).

256375013 is an equidigital number, since it uses as much as digits as its factorization.

256375013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18900, while the sum is 32.

The square root of 256375013 is about 16011.7148675587. The cubic root of 256375013 is about 635.2703195295.

The spelling of 256375013 in words is "two hundred fifty-six million, three hundred seventy-five thousand, thirteen".