91975689 has 32 divisors (see below), whose sum is σ = 153135360. Its totient is φ = 54134784.

The previous prime is 91975679. The next prime is 91975699. The reversal of 91975689 is 98657919.

It is an interprime number because it is at equal distance from previous prime (91975679) and next prime (91975699).

It is not a de Polignac number, because 91975689 - 2¹¹ = 91973641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91975619) 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 31 ways as a sum of consecutive naturals, for example, 2377 + ... + 13769.

It is an arithmetic number, because the mean of its divisors is an integer number (4785480).

Almost surely, 2^91975689 is an apocalyptic number.

It is an amenable number.

91975689 is a deficient number, since it is larger than the sum of its proper divisors (61159671).

91975689 is a wasteful number, since it uses less digits than its factorization.

91975689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11438 (or 11432 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 91975689 is about 9590.3956644134. The cubic root of 91975689 is about 451.3959760793.

The spelling of 91975689 in words is "ninety-one million, nine hundred seventy-five thousand, six hundred eighty-nine".