91184089 has 4 divisors (see below), whose sum is σ = 93124224. Its totient is φ = 89243956.

The previous prime is 91184069. The next prime is 91184111. The reversal of 91184089 is 98048119.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98048119 = 13 ⋅7542163.

It is a cyclic number.

It is not a de Polignac number, because 91184089 - 2⁵ = 91184057 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91184069) 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, 969997 + ... + 970090.

It is an arithmetic number, because the mean of its divisors is an integer number (23281056).

Almost surely, 2^91184089 is an apocalyptic number.

It is an amenable number.

91184089 is a deficient number, since it is larger than the sum of its proper divisors (1940135).

91184089 is a wasteful number, since it uses less digits than its factorization.

91184089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940134.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 91184089 is about 9549.0360246467. The cubic root of 91184089 is about 450.0972448275.

The spelling of 91184089 in words is "ninety-one million, one hundred eighty-four thousand, eighty-nine".