91372689 has 24 divisors (see below), whose sum is σ = 135233280. Its totient is φ = 59428512.

The previous prime is 91372663. The next prime is 91372709. The reversal of 91372689 is 98627319.

It is a de Polignac number, because none of the positive numbers 2^k-91372689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91372609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 105942 + ... + 106800.

It is an arithmetic number, because the mean of its divisors is an integer number (5634720).

Almost surely, 2^91372689 is an apocalyptic number.

It is an amenable number.

91372689 is a deficient number, since it is larger than the sum of its proper divisors (43860591).

91372689 is a wasteful number, since it uses less digits than its factorization.

91372689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141 (or 1138 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 91372689 is about 9558.9062658863. The cubic root of 91372689 is about 450.4073496656.

The spelling of 91372689 in words is "ninety-one million, three hundred seventy-two thousand, six hundred eighty-nine".