317865913 has 2 divisors, whose sum is σ = 317865914. Its totient is φ = 317865912.

The previous prime is 317865851. The next prime is 317865917. The reversal of 317865913 is 319568713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 315133504 + 2732409 = 17752^2 + 1653^2 .

It is a cyclic number.

It is not a de Polignac number, because 317865913 - 2²⁵ = 284311481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 317865913.

It is not a weakly prime, because it can be changed into another prime (317865917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158932956 + 158932957.

It is an arithmetic number, because the mean of its divisors is an integer number (158932957).

Almost surely, 2^317865913 is an apocalyptic number.

It is an amenable number.

317865913 is a deficient number, since it is larger than the sum of its proper divisors (1).

317865913 is an equidigital number, since it uses as much as digits as its factorization.

317865913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 317865913 is about 17828.7944909352. The cubic root of 317865913 is about 682.4664703749.

The spelling of 317865913 in words is "three hundred seventeen million, eight hundred sixty-five thousand, nine hundred thirteen".