991332113111 has 2 divisors, whose sum is σ = 991332113112. Its totient is φ = 991332113110.

The previous prime is 991332113063. The next prime is 991332113113. The reversal of 991332113111 is 111311233199.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 991332113111 - 2³⁰ = 990258371287 is a prime.

Together with 991332113113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991332113113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495666056555 + 495666056556.

It is an arithmetic number, because the mean of its divisors is an integer number (495666056556).

Almost surely, 2^991332113111 is an apocalyptic number.

991332113111 is a deficient number, since it is larger than the sum of its proper divisors (1).

991332113111 is an equidigital number, since it uses as much as digits as its factorization.

991332113111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374, while the sum is 35.

The spelling of 991332113111 in words is "nine hundred ninety-one billion, three hundred thirty-two million, one hundred thirteen thousand, one hundred eleven".