256683013 has 4 divisors (see below), whose sum is σ = 267843168. Its totient is φ = 245522860.

The previous prime is 256682971. The next prime is 256683029. The reversal of 256683013 is 310386652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256683013 - 2⁹ = 256682501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256683013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256683073) 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 in 3 ways as a sum of consecutive naturals, for example, 5580043 + ... + 5580088.

It is an arithmetic number, because the mean of its divisors is an integer number (66960792).

Almost surely, 2^256683013 is an apocalyptic number.

256683013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

256683013 is a deficient number, since it is larger than the sum of its proper divisors (11160155).

256683013 is a wasteful number, since it uses less digits than its factorization.

256683013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11160154.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 256683013 is about 16021.3299385538. The cubic root of 256683013 is about 635.5246149255.

The spelling of 256683013 in words is "two hundred fifty-six million, six hundred eighty-three thousand, thirteen".