91679997 has 16 divisors (see below), whose sum is σ = 136244160. Its totient is φ = 54496512.

The previous prime is 91679971. The next prime is 91680007. The reversal of 91679997 is 79997619.

It is not a de Polignac number, because 91679997 - 2⁷ = 91679869 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91679947) 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 15 ways as a sum of consecutive naturals, for example, 46338 + ... + 48275.

It is an arithmetic number, because the mean of its divisors is an integer number (8515260).

Almost surely, 2^91679997 is an apocalyptic number.

It is an amenable number.

91679997 is a deficient number, since it is larger than the sum of its proper divisors (44564163).

91679997 is a wasteful number, since it uses less digits than its factorization.

91679997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94652.

The product of its digits is 1928934, while the sum is 57.

The square root of 91679997 is about 9574.9672062102. The cubic root of 91679997 is about 450.9117268481.

The spelling of 91679997 in words is "ninety-one million, six hundred seventy-nine thousand, nine hundred ninety-seven".