91159772 has 48 divisors (see below), whose sum is σ = 178797024. Its totient is φ = 40320000.

The previous prime is 91159771. The next prime is 91159781. The reversal of 91159772 is 27795119.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91159771) 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, 324272 + ... + 324552.

It is an arithmetic number, because the mean of its divisors is an integer number (3724938).

Almost surely, 2^91159772 is an apocalyptic number.

It is an amenable number.

91159772 is a deficient number, since it is larger than the sum of its proper divisors (87637252).

91159772 is a wasteful number, since it uses less digits than its factorization.

91159772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470 (or 468 counting only the distinct ones).

The product of its digits is 39690, while the sum is 41.

The square root of 91159772 is about 9547.7626698615. The cubic root of 91159772 is about 450.0572305812.

The spelling of 91159772 in words is "ninety-one million, one hundred fifty-nine thousand, seven hundred seventy-two".