91331873 has 8 divisors (see below), whose sum is σ = 97879488. Its totient is φ = 84999024.

The previous prime is 91331869. The next prime is 91331881. The reversal of 91331873 is 37813319.

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

It is a cyclic number.

It is not a de Polignac number, because 91331873 - 2² = 91331869 is a prime.

It is a super-2 number, since 2×91331873² = 16683022051376258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91331813) 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, 52811 + ... + 54512.

It is an arithmetic number, because the mean of its divisors is an integer number (12234936).

Almost surely, 2^91331873 is an apocalyptic number.

It is an amenable number.

91331873 is a deficient number, since it is larger than the sum of its proper divisors (6547615).

91331873 is a wasteful number, since it uses less digits than its factorization.

91331873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107383.

The product of its digits is 13608, while the sum is 35.

The square root of 91331873 is about 9556.7710551211. The cubic root of 91331873 is about 450.3402743188.

The spelling of 91331873 in words is "ninety-one million, three hundred thirty-one thousand, eight hundred seventy-three".