317071987 has 2 divisors, whose sum is σ = 317071988. Its totient is φ = 317071986.

The previous prime is 317071969. The next prime is 317071991. The reversal of 317071987 is 789170713.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-317071987 is a prime.

It is not a weakly prime, because it can be changed into another prime (317071687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158535993 + 158535994.

It is an arithmetic number, because the mean of its divisors is an integer number (158535994).

Almost surely, 2^317071987 is an apocalyptic number.

317071987 is a deficient number, since it is larger than the sum of its proper divisors (1).

317071987 is an equidigital number, since it uses as much as digits as its factorization.

317071987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 74088, while the sum is 43.

The square root of 317071987 is about 17806.5152963740. The cubic root of 317071987 is about 681.8978033330.

It can be divided in two parts, 3170 and 71987, that added together give a palindrome (75157).

The spelling of 317071987 in words is "three hundred seventeen million, seventy-one thousand, nine hundred eighty-seven".