91561092 has 24 divisors (see below), whose sum is σ = 244163136. Its totient is φ = 26160288.

The previous prime is 91561027. The next prime is 91561109. The reversal of 91561092 is 29016519.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 544923 + ... + 545090.

It is an arithmetic number, because the mean of its divisors is an integer number (10173464).

Almost surely, 2^91561092 is an apocalyptic number.

It is an amenable number.

91561092 is an abundant number, since it is smaller than the sum of its proper divisors (152602044).

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

91561092 is a wasteful number, since it uses less digits than its factorization.

91561092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090027 (or 1090025 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 91561092 is about 9568.7560320033. The cubic root of 91561092 is about 450.7167048280.

The spelling of 91561092 in words is "ninety-one million, five hundred sixty-one thousand, ninety-two".