317521889 has 2 divisors, whose sum is σ = 317521890. Its totient is φ = 317521888.

The previous prime is 317521859. The next prime is 317521891. The reversal of 317521889 is 988125713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 310041664 + 7480225 = 17608^2 + 2735^2 .

It is a cyclic number.

It is not a de Polignac number, because 317521889 - 2¹⁶ = 317456353 is a prime.

Together with 317521891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (317521849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158760944 + 158760945.

It is an arithmetic number, because the mean of its divisors is an integer number (158760945).

Almost surely, 2^317521889 is an apocalyptic number.

It is an amenable number.

317521889 is a deficient number, since it is larger than the sum of its proper divisors (1).

317521889 is an equidigital number, since it uses as much as digits as its factorization.

317521889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 44.

The square root of 317521889 is about 17819.1438907710. The cubic root of 317521889 is about 682.2201719742.

The spelling of 317521889 in words is "three hundred seventeen million, five hundred twenty-one thousand, eight hundred eighty-nine".