90979191 has 24 divisors (see below), whose sum is σ = 137844096. Its totient is φ = 57713040.

The previous prime is 90979171. The next prime is 90979219. The reversal of 90979191 is 19197909.

It is not a de Polignac number, because 90979191 - 2⁵ = 90979159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90979171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42636 + ... + 44718.

It is an arithmetic number, because the mean of its divisors is an integer number (5743504).

Almost surely, 2^90979191 is an apocalyptic number.

90979191 is a deficient number, since it is larger than the sum of its proper divisors (46864905).

90979191 is a wasteful number, since it uses less digits than its factorization.

90979191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2323 (or 2320 counting only the distinct ones).

The product of its (nonzero) digits is 45927, while the sum is 45.

The square root of 90979191 is about 9538.3012638520. The cubic root of 90979191 is about 449.7598570555.

The spelling of 90979191 in words is "ninety million, nine hundred seventy-nine thousand, one hundred ninety-one".