256279013 has 2 divisors, whose sum is σ = 256279014. Its totient is φ = 256279012.

The previous prime is 256279007. The next prime is 256279033. The reversal of 256279013 is 310972652.

256279013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150970369 + 105308644 = 12287^2 + 10262^2 .

It is a cyclic number.

It is not a de Polignac number, because 256279013 - 2¹² = 256274917 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256279033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128139506 + 128139507.

It is an arithmetic number, because the mean of its divisors is an integer number (128139507).

Almost surely, 2^256279013 is an apocalyptic number.

It is an amenable number.

256279013 is a deficient number, since it is larger than the sum of its proper divisors (1).

256279013 is an equidigital number, since it uses as much as digits as its factorization.

256279013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 256279013 is about 16008.7167818036. The cubic root of 256279013 is about 635.1910169958.

The spelling of 256279013 in words is "two hundred fifty-six million, two hundred seventy-nine thousand, thirteen".