91332973 has 4 divisors (see below), whose sum is σ = 91362460. Its totient is φ = 91303488.

The previous prime is 91332949. The next prime is 91332979. The reversal of 91332973 is 37923319.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55308969 + 36024004 = 7437^2 + 6002^2 .

It is a cyclic number.

It is not a de Polignac number, because 91332973 - 2²¹ = 89235821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91332979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9468 + ... + 16501.

It is an arithmetic number, because the mean of its divisors is an integer number (22840615).

Almost surely, 2^91332973 is an apocalyptic number.

It is an amenable number.

91332973 is a deficient number, since it is larger than the sum of its proper divisors (29487).

91332973 is a wasteful number, since it uses less digits than its factorization.

91332973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29486.

The product of its digits is 30618, while the sum is 37.

The square root of 91332973 is about 9556.8286057667. The cubic root of 91332973 is about 450.3420822759.

The spelling of 91332973 in words is "ninety-one million, three hundred thirty-two thousand, nine hundred seventy-three".