91090992 has 20 divisors (see below), whose sum is σ = 235318520. Its totient is φ = 30363648.

The previous prime is 91090957. The next prime is 91091023. The reversal of 91090992 is 29909019.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 91090992.

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, 948817 + ... + 948912.

It is an arithmetic number, because the mean of its divisors is an integer number (11765926).

Almost surely, 2^91090992 is an apocalyptic number.

It is an amenable number.

91090992 is an abundant number, since it is smaller than the sum of its proper divisors (144227528).

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

91090992 is a wasteful number, since it uses less digits than its factorization.

91090992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1897740 (or 1897734 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 39.

The square root of 91090992 is about 9544.1600992439. The cubic root of 91090992 is about 449.9440127877.

The spelling of 91090992 in words is "ninety-one million, ninety thousand, nine hundred ninety-two".