256970617 has 4 divisors (see below), whose sum is σ = 257085556. Its totient is φ = 256855680.

The previous prime is 256970603. The next prime is 256970621. The reversal of 256970617 is 716079652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 87684496 + 169286121 = 9364^2 + 13011^2 .

It is a cyclic number.

It is not a de Polignac number, because 256970617 - 2¹⁹ = 256446329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256970627) 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, 54048 + ... + 58609.

It is an arithmetic number, because the mean of its divisors is an integer number (64271389).

Almost surely, 2^256970617 is an apocalyptic number.

It is an amenable number.

256970617 is a deficient number, since it is larger than the sum of its proper divisors (114939).

256970617 is a wasteful number, since it uses less digits than its factorization.

256970617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114938.

The product of its (nonzero) digits is 158760, while the sum is 43.

The square root of 256970617 is about 16030.3030850948. The cubic root of 256970617 is about 635.7618870843.

The spelling of 256970617 in words is "two hundred fifty-six million, nine hundred seventy thousand, six hundred seventeen".