331990212913 has 2 divisors, whose sum is σ = 331990212914. Its totient is φ = 331990212912.

The previous prime is 331990212859. The next prime is 331990212937. The reversal of 331990212913 is 319212099133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243845353249 + 88144859664 = 493807^2 + 296892^2 .

It is a cyclic number.

It is not a de Polignac number, because 331990212913 - 2³³ = 323400278321 is a prime.

It is a super-2 number, since 2×331990212913² (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 331990212913.

It is not a weakly prime, because it can be changed into another prime (331990212973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165995106456 + 165995106457.

It is an arithmetic number, because the mean of its divisors is an integer number (165995106457).

Almost surely, 2^331990212913 is an apocalyptic number.

It is an amenable number.

331990212913 is a deficient number, since it is larger than the sum of its proper divisors (1).

331990212913 is an equidigital number, since it uses as much as digits as its factorization.

331990212913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 43.

The spelling of 331990212913 in words is "three hundred thirty-one billion, nine hundred ninety million, two hundred twelve thousand, nine hundred thirteen".