256957613 has 4 divisors (see below), whose sum is σ = 280317408. Its totient is φ = 233597820.

The previous prime is 256957607. The next prime is 256957627. The reversal of 256957613 is 316759652.

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 256957613 - 2¹² = 256953517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256957643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11679881 + ... + 11679902.

It is an arithmetic number, because the mean of its divisors is an integer number (70079352).

Almost surely, 2^256957613 is an apocalyptic number.

It is an amenable number.

256957613 is a deficient number, since it is larger than the sum of its proper divisors (23359795).

256957613 is a wasteful number, since it uses less digits than its factorization.

256957613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23359794.

The product of its digits is 340200, while the sum is 44.

The square root of 256957613 is about 16029.8974731593. The cubic root of 256957613 is about 635.7511626584.

The spelling of 256957613 in words is "two hundred fifty-six million, nine hundred fifty-seven thousand, six hundred thirteen".