256107317 has 2 divisors, whose sum is σ = 256107318. Its totient is φ = 256107316.

The previous prime is 256107283. The next prime is 256107343. The reversal of 256107317 is 713701652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199346161 + 56761156 = 14119^2 + 7534^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256107317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256107017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128053658 + 128053659.

It is an arithmetic number, because the mean of its divisors is an integer number (128053659).

Almost surely, 2^256107317 is an apocalyptic number.

It is an amenable number.

256107317 is a deficient number, since it is larger than the sum of its proper divisors (1).

256107317 is an equidigital number, since it uses as much as digits as its factorization.

256107317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 256107317 is about 16003.3533048546. The cubic root of 256107317 is about 635.0491350162.

Adding to 256107317 its reverse (713701652), we get a palindrome (969808969).

The spelling of 256107317 in words is "two hundred fifty-six million, one hundred seven thousand, three hundred seventeen".