331202113101991 has 2 divisors, whose sum is σ = 331202113101992. Its totient is φ = 331202113101990.

The previous prime is 331202113101971. The next prime is 331202113102099. The reversal of 331202113101991 is 199101311202133.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 331202113101991 - 2⁹ = 331202113101479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 331202113101991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331202113101911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165601056550995 + 165601056550996.

It is an arithmetic number, because the mean of its divisors is an integer number (165601056550996).

Almost surely, 2^{331202113101991} is an apocalyptic number.

331202113101991 is a deficient number, since it is larger than the sum of its proper divisors (1).

331202113101991 is an equidigital number, since it uses as much as digits as its factorization.

331202113101991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 37.

The spelling of 331202113101991 in words is "three hundred thirty-one trillion, two hundred two billion, one hundred thirteen million, one hundred one thousand, nine hundred ninety-one".