91572117 has 16 divisors (see below), whose sum is σ = 150272640. Its totient is φ = 48301632.

The previous prime is 91572043. The next prime is 91572119. The reversal of 91572117 is 71127519.

It is not a de Polignac number, because 91572117 - 2¹⁰ = 91571093 is a prime.

It is a super-2 number, since 2×91572117² = 16770905223723378, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91572119) 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, 167442 + ... + 167987.

It is an arithmetic number, because the mean of its divisors is an integer number (9392040).

Almost surely, 2^91572117 is an apocalyptic number.

It is an amenable number.

91572117 is a deficient number, since it is larger than the sum of its proper divisors (58700523).

91572117 is a wasteful number, since it uses less digits than its factorization.

91572117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335452.

The product of its digits is 4410, while the sum is 33.

The square root of 91572117 is about 9569.3321083553. The cubic root of 91572117 is about 450.7347945796.

The spelling of 91572117 in words is "ninety-one million, five hundred seventy-two thousand, one hundred seventeen".