91211100111 has 16 divisors (see below), whose sum is σ = 136755601920. Its totient is φ = 60074779320.

The previous prime is 91211100053. The next prime is 91211100131. The reversal of 91211100111 is 11100111219.

It is not a de Polignac number, because 91211100111 - 2²¹ = 91209002959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91211100131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20348295 + ... + 20352776.

It is an arithmetic number, because the mean of its divisors is an integer number (8547225120).

Almost surely, 2^91211100111 is an apocalyptic number.

91211100111 is a deficient number, since it is larger than the sum of its proper divisors (45544501809).

91211100111 is a wasteful number, since it uses less digits than its factorization.

91211100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40701163 (or 40701157 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 18.

The spelling of 91211100111 in words is "ninety-one billion, two hundred eleven million, one hundred thousand, one hundred eleven".