317765948821 has 2 divisors, whose sum is σ = 317765948822. Its totient is φ = 317765948820.

The previous prime is 317765948777. The next prime is 317765948827. The reversal of 317765948821 is 128849567713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 253104579025 + 64661369796 = 503095^2 + 254286^2 .

It is a cyclic number.

It is not a de Polignac number, because 317765948821 - 2⁹ = 317765948309 is a prime.

It is a super-2 number, since 2×317765948821² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 317765948821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (317765948827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158882974410 + 158882974411.

It is an arithmetic number, because the mean of its divisors is an integer number (158882974411).

Almost surely, 2^317765948821 is an apocalyptic number.

It is an amenable number.

317765948821 is a deficient number, since it is larger than the sum of its proper divisors (1).

317765948821 is an equidigital number, since it uses as much as digits as its factorization.

317765948821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20321280, while the sum is 61.

The spelling of 317765948821 in words is "three hundred seventeen billion, seven hundred sixty-five million, nine hundred forty-eight thousand, eight hundred twenty-one".