317949502421 has 2 divisors, whose sum is σ = 317949502422. Its totient is φ = 317949502420.

The previous prime is 317949502393. The next prime is 317949502469. The reversal of 317949502421 is 124205949713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202018786225 + 115930716196 = 449465^2 + 340486^2 .

It is a cyclic number.

It is not a de Polignac number, because 317949502421 - 2⁶ = 317949502357 is a prime.

It is a super-2 number, since 2×317949502421² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (317949502121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158974751210 + 158974751211.

It is an arithmetic number, because the mean of its divisors is an integer number (158974751211).

Almost surely, 2^317949502421 is an apocalyptic number.

It is an amenable number.

317949502421 is a deficient number, since it is larger than the sum of its proper divisors (1).

317949502421 is an equidigital number, since it uses as much as digits as its factorization.

317949502421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 317949502421 in words is "three hundred seventeen billion, nine hundred forty-nine million, five hundred two thousand, four hundred twenty-one".