317071621 has 2 divisors, whose sum is σ = 317071622. Its totient is φ = 317071620.

The previous prime is 317071609. The next prime is 317071661. The reversal of 317071621 is 126170713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167987521 + 149084100 = 12961^2 + 12210^2 .

It is a cyclic number.

It is not a de Polignac number, because 317071621 - 2²¹ = 314974469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 317071621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (317071661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158535810 + 158535811.

It is an arithmetic number, because the mean of its divisors is an integer number (158535811).

Almost surely, 2^317071621 is an apocalyptic number.

It is an amenable number.

317071621 is a deficient number, since it is larger than the sum of its proper divisors (1).

317071621 is an equidigital number, since it uses as much as digits as its factorization.

317071621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 317071621 is about 17806.5050192338. The cubic root of 317071621 is about 681.8975409586.

The spelling of 317071621 in words is "three hundred seventeen million, seventy-one thousand, six hundred twenty-one".