91211091911 has 2 divisors, whose sum is σ = 91211091912. Its totient is φ = 91211091910.

The previous prime is 91211091833. The next prime is 91211091971. The reversal of 91211091911 is 11919011219.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91211091911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91211091971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45605545955 + 45605545956.

It is an arithmetic number, because the mean of its divisors is an integer number (45605545956).

Almost surely, 2^91211091911 is an apocalyptic number.

91211091911 is a deficient number, since it is larger than the sum of its proper divisors (1).

91211091911 is an equidigital number, since it uses as much as digits as its factorization.

91211091911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 35.

The spelling of 91211091911 in words is "ninety-one billion, two hundred eleven million, ninety-one thousand, nine hundred eleven".