317392987 has 2 divisors, whose sum is σ = 317392988. Its totient is φ = 317392986.

The previous prime is 317392979. The next prime is 317393033. The reversal of 317392987 is 789293713.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 317392987 - 2³ = 317392979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 317392987.

It is not a weakly prime, because it can be changed into another prime (317392087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158696493 + 158696494.

It is an arithmetic number, because the mean of its divisors is an integer number (158696494).

Almost surely, 2^317392987 is an apocalyptic number.

317392987 is a deficient number, since it is larger than the sum of its proper divisors (1).

317392987 is an equidigital number, since it uses as much as digits as its factorization.

317392987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 49.

The square root of 317392987 is about 17815.5265709437. The cubic root of 317392987 is about 682.1278408622.

The spelling of 317392987 in words is "three hundred seventeen million, three hundred ninety-two thousand, nine hundred eighty-seven".