91192091 has 4 divisors (see below), whose sum is σ = 91422192. Its totient is φ = 90961992.

The previous prime is 91192067. The next prime is 91192093. The reversal of 91192091 is 19029119.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91192091 - 2⁶ = 91192027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91192093) 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, 114455 + ... + 115248.

It is an arithmetic number, because the mean of its divisors is an integer number (22855548).

Almost surely, 2^91192091 is an apocalyptic number.

91192091 is a deficient number, since it is larger than the sum of its proper divisors (230101).

91192091 is a wasteful number, since it uses less digits than its factorization.

91192091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230100.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 91192091 is about 9549.4550106276. The cubic root of 91192091 is about 450.1104107678.

The spelling of 91192091 in words is "ninety-one million, one hundred ninety-two thousand, ninety-one".