91881392 has 20 divisors (see below), whose sum is σ = 179009376. Its totient is φ = 45685440.

The previous prime is 91881371. The next prime is 91881401. The reversal of 91881392 is 29318819.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12968 + ... + 18759.

Almost surely, 2^91881392 is an apocalyptic number.

It is an amenable number.

91881392 is a deficient number, since it is larger than the sum of its proper divisors (87127984).

91881392 is a wasteful number, since it uses less digits than its factorization.

91881392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31916 (or 31910 counting only the distinct ones).

The product of its digits is 31104, while the sum is 41.

The square root of 91881392 is about 9585.4781831685. The cubic root of 91881392 is about 451.2416605145.

The spelling of 91881392 in words is "ninety-one million, eight hundred eighty-one thousand, three hundred ninety-two".