91130091 has 16 divisors (see below), whose sum is σ = 131147520. Its totient is φ = 55954080.

The previous prime is 91130069. The next prime is 91130101. The reversal of 91130091 is 19003119.

It is not a de Polignac number, because 91130091 - 2⁵ = 91130059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91130021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16770 + ... + 21528.

It is an arithmetic number, because the mean of its divisors is an integer number (8196720).

Almost surely, 2^91130091 is an apocalyptic number.

91130091 is a deficient number, since it is larger than the sum of its proper divisors (40017429).

91130091 is a wasteful number, since it uses less digits than its factorization.

91130091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5266.

The product of its (nonzero) digits is 243, while the sum is 24.

The square root of 91130091 is about 9546.2082001180. The cubic root of 91130091 is about 450.0083800909.

The spelling of 91130091 in words is "ninety-one million, one hundred thirty thousand, ninety-one".