256708717 has 2 divisors, whose sum is σ = 256708718. Its totient is φ = 256708716.

The previous prime is 256708703. The next prime is 256708723. The reversal of 256708717 is 717807652.

256708717 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., 215825481 + 40883236 = 14691^2 + 6394^2 .

It is a cyclic number.

It is not a de Polignac number, because 256708717 - 2¹¹ = 256706669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256708747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128354358 + 128354359.

It is an arithmetic number, because the mean of its divisors is an integer number (128354359).

Almost surely, 2^256708717 is an apocalyptic number.

It is an amenable number.

256708717 is a deficient number, since it is larger than the sum of its proper divisors (1).

256708717 is an equidigital number, since it uses as much as digits as its factorization.

256708717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 164640, while the sum is 43.

The square root of 256708717 is about 16022.1320990685. The cubic root of 256708717 is about 635.5458278335.

The spelling of 256708717 in words is "two hundred fifty-six million, seven hundred eight thousand, seven hundred seventeen".