91161904 has 10 divisors (see below), whose sum is σ = 176626220. Its totient is φ = 45580944.

The previous prime is 91161883. The next prime is 91161911. The reversal of 91161904 is 40916119.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2848794 + ... + 2848825.

It is an arithmetic number, because the mean of its divisors is an integer number (17662622).

Almost surely, 2^91161904 is an apocalyptic number.

It is an amenable number.

91161904 is a deficient number, since it is larger than the sum of its proper divisors (85464316).

91161904 is a wasteful number, since it uses less digits than its factorization.

91161904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5697627 (or 5697621 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 91161904 is about 9547.8743184020. The cubic root of 91161904 is about 450.0607391264.

The spelling of 91161904 in words is "ninety-one million, one hundred sixty-one thousand, nine hundred four".