91183820912 has 40 divisors (see below), whose sum is σ = 184828295232. Its totient is φ = 43533516800.

The previous prime is 91183820891. The next prime is 91183820929. The reversal of 91183820912 is 21902838119.

It is a happy number.

It is a super-2 number, since 2×91183820912² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1447889 + ... + 1509552.

Almost surely, 2^91183820912 is an apocalyptic number.

It is an amenable number.

91183820912 is an abundant number, since it is smaller than the sum of its proper divisors (93644474320).

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

91183820912 is a wasteful number, since it uses less digits than its factorization.

91183820912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2957537 (or 2957531 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 44.

The spelling of 91183820912 in words is "ninety-one billion, one hundred eighty-three million, eight hundred twenty thousand, nine hundred twelve".