91127972 has 24 divisors (see below), whose sum is σ = 177284352. Its totient is φ = 40701600.

The previous prime is 91127969. The next prime is 91127977. The reversal of 91127972 is 27972119.

It is not an unprimeable number, because it can be changed into a prime (91127977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26654 + ... + 29877.

It is an arithmetic number, because the mean of its divisors is an integer number (7386848).

Almost surely, 2^91127972 is an apocalyptic number.

It is an amenable number.

91127972 is a deficient number, since it is larger than the sum of its proper divisors (86156380).

91127972 is a wasteful number, since it uses less digits than its factorization.

91127972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56579 (or 56577 counting only the distinct ones).

The product of its digits is 15876, while the sum is 38.

The square root of 91127972 is about 9546.0972129976. The cubic root of 91127972 is about 450.0048921279.

The spelling of 91127972 in words is "ninety-one million, one hundred twenty-seven thousand, nine hundred seventy-two".