91689983 has 24 divisors (see below), whose sum is σ = 119554176. Its totient is φ = 68310000.

The previous prime is 91689977. The next prime is 91689989. The reversal of 91689983 is 38998619.

It is an interprime number because it is at equal distance from previous prime (91689977) and next prime (91689989).

It is not a de Polignac number, because 91689983 - 2⁶ = 91689919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91689989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39608 + ... + 41858.

It is an arithmetic number, because the mean of its divisors is an integer number (4981424).

Almost surely, 2^91689983 is an apocalyptic number.

91689983 is a deficient number, since it is larger than the sum of its proper divisors (27864193).

91689983 is a wasteful number, since it uses less digits than its factorization.

91689983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2315 (or 2292 counting only the distinct ones).

The product of its digits is 839808, while the sum is 53.

The square root of 91689983 is about 9575.4886559381. The cubic root of 91689983 is about 450.9280977076.

The spelling of 91689983 in words is "ninety-one million, six hundred eighty-nine thousand, nine hundred eighty-three".