91663873 has 8 divisors (see below), whose sum is σ = 104817600. Its totient is φ = 78524880.

The previous prime is 91663841. The next prime is 91663883. The reversal of 91663873 is 37836619.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91663873 - 2⁵ = 91663841 is a prime.

It is a super-2 number, since 2×91663873² = 16804531226720258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91663883) 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 7 ways as a sum of consecutive naturals, for example, 18903 + ... + 23251.

It is an arithmetic number, because the mean of its divisors is an integer number (13102200).

Almost surely, 2^91663873 is an apocalyptic number.

It is an amenable number.

91663873 is a deficient number, since it is larger than the sum of its proper divisors (13153727).

91663873 is a wasteful number, since it uses less digits than its factorization.

91663873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7367.

The product of its digits is 163296, while the sum is 43.

The square root of 91663873 is about 9574.1251819683. The cubic root of 91663873 is about 450.8852909581.

The spelling of 91663873 in words is "ninety-one million, six hundred sixty-three thousand, eight hundred seventy-three".