256297617 has 12 divisors (see below), whose sum is σ = 370346704. Its totient is φ = 170800920.

The previous prime is 256297607. The next prime is 256297637. The reversal of 256297617 is 716792652.

256297617 is a `hidden beast` number, since 2 + 5 + 6 + 29 + 7 + 617 = 666.

256297617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256297617 - 2¹⁸ = 256035473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256297607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42258 + ... + 47940.

Almost surely, 2^256297617 is an apocalyptic number.

It is an amenable number.

256297617 is a deficient number, since it is larger than the sum of its proper divisors (114049087).

256297617 is a wasteful number, since it uses less digits than its factorization.

256297617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10700 (or 10697 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 256297617 is about 16009.2978296988. The cubic root of 256297617 is about 635.2063867128.

The spelling of 256297617 in words is "two hundred fifty-six million, two hundred ninety-seven thousand, six hundred seventeen".