91211912 has 16 divisors (see below), whose sum is σ = 186570000. Its totient is φ = 41459920.

The previous prime is 91211909. The next prime is 91211927. The reversal of 91211912 is 21911219.

It is a super-2 number, since 2×91211912² = 16639225781391488, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 518162 + ... + 518337.

It is an arithmetic number, because the mean of its divisors is an integer number (11660625).

Almost surely, 2^91211912 is an apocalyptic number.

It is an amenable number.

91211912 is an abundant number, since it is smaller than the sum of its proper divisors (95358088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91211912 is a wasteful number, since it uses less digits than its factorization.

91211912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036516 (or 1036512 counting only the distinct ones).

The product of its digits is 324, while the sum is 26.

The square root of 91211912 is about 9550.4927621563. The cubic root of 91211912 is about 450.1430195611.

The spelling of 91211912 in words is "ninety-one million, two hundred eleven thousand, nine hundred twelve".