91291161 has 16 divisors (see below), whose sum is σ = 132935040. Its totient is φ = 55386240.

The previous prime is 91291153. The next prime is 91291177. The reversal of 91291161 is 16119219.

It is not a de Polignac number, because 91291161 - 2³ = 91291153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91291111) 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, 13716 + ... + 19253.

It is an arithmetic number, because the mean of its divisors is an integer number (8308440).

Almost surely, 2^91291161 is an apocalyptic number.

It is an amenable number.

91291161 is a deficient number, since it is larger than the sum of its proper divisors (41643879).

91291161 is a wasteful number, since it uses less digits than its factorization.

91291161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33056.

The product of its digits is 972, while the sum is 30.

The square root of 91291161 is about 9554.6408095752. The cubic root of 91291161 is about 450.2733499709.

The spelling of 91291161 in words is "ninety-one million, two hundred ninety-one thousand, one hundred sixty-one".