256170517 has 2 divisors, whose sum is σ = 256170518. Its totient is φ = 256170516.

The previous prime is 256170503. The next prime is 256170529. The reversal of 256170517 is 715071652.

It is a happy number.

256170517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204890596 + 51279921 = 14314^2 + 7161^2 .

It is a cyclic number.

It is not a de Polignac number, because 256170517 - 2²³ = 247781909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256170017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128085258 + 128085259.

It is an arithmetic number, because the mean of its divisors is an integer number (128085259).

Almost surely, 2^256170517 is an apocalyptic number.

It is an amenable number.

256170517 is a deficient number, since it is larger than the sum of its proper divisors (1).

256170517 is an equidigital number, since it uses as much as digits as its factorization.

256170517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14700, while the sum is 34.

The square root of 256170517 is about 16005.3277692148. The cubic root of 256170517 is about 635.1013680734.

The spelling of 256170517 in words is "two hundred fifty-six million, one hundred seventy thousand, five hundred seventeen".