91913992 has 16 divisors (see below), whose sum is σ = 178281900. Its totient is φ = 44372160.

The previous prime is 91913989. The next prime is 91913993. The reversal of 91913992 is 29931919.

It can be written as a sum of positive squares in 2 ways, for example, as 88623396 + 3290596 = 9414^2 + 1814^2 .

It is not an unprimeable number, because it can be changed into a prime (91913993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197859 + ... + 198322.

Almost surely, 2^91913992 is an apocalyptic number.

It is an amenable number.

91913992 is a deficient number, since it is larger than the sum of its proper divisors (86367908).

91913992 is a wasteful number, since it uses less digits than its factorization.

91913992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396216 (or 396212 counting only the distinct ones).

The product of its digits is 39366, while the sum is 43.

The square root of 91913992 is about 9587.1785213378. The cubic root of 91913992 is about 451.2950218404.

The spelling of 91913992 in words is "ninety-one million, nine hundred thirteen thousand, nine hundred ninety-two".