311332311991 has 2 divisors, whose sum is σ = 311332311992. Its totient is φ = 311332311990.

The previous prime is 311332311977. The next prime is 311332312001. The reversal of 311332311991 is 199113233113.

It is a strong prime.

It is an emirp because it is prime and its reverse (199113233113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311332311991 - 2⁷ = 311332311863 is a prime.

It is a super-2 number, since 2×311332311991² (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 311332311991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311332311931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155666155995 + 155666155996.

It is an arithmetic number, because the mean of its divisors is an integer number (155666155996).

Almost surely, 2^311332311991 is an apocalyptic number.

311332311991 is a deficient number, since it is larger than the sum of its proper divisors (1).

311332311991 is an equidigital number, since it uses as much as digits as its factorization.

311332311991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13122, while the sum is 37.

The spelling of 311332311991 in words is "three hundred eleven billion, three hundred thirty-two million, three hundred eleven thousand, nine hundred ninety-one".