91911612 has 48 divisors (see below), whose sum is σ = 231662592. Its totient is φ = 28194240.

The previous prime is 91911581. The next prime is 91911629. The reversal of 91911612 is 21611919.

It is a self number, because there is not a number n which added to its sum of digits gives 91911612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66553 + ... + 67919.

It is an arithmetic number, because the mean of its divisors is an integer number (4826304).

Almost surely, 2^91911612 is an apocalyptic number.

It is an amenable number.

91911612 is an abundant number, since it is smaller than the sum of its proper divisors (139750980).

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

91911612 is a wasteful number, since it uses less digits than its factorization.

91911612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818 (or 1816 counting only the distinct ones).

The product of its digits is 972, while the sum is 30.

The square root of 91911612 is about 9587.0543964244. The cubic root of 91911612 is about 451.2911265632.

The spelling of 91911612 in words is "ninety-one million, nine hundred eleven thousand, six hundred twelve".