91722393 has 12 divisors (see below), whose sum is σ = 151414848. Its totient is φ = 52412760.

The previous prime is 91722391. The next prime is 91722409. The reversal of 91722393 is 39322719.

It is not a de Polignac number, because 91722393 - 2¹ = 91722391 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (91722391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 727893 + ... + 728018.

It is an arithmetic number, because the mean of its divisors is an integer number (12617904).

Almost surely, 2^91722393 is an apocalyptic number.

It is an amenable number.

91722393 is a deficient number, since it is larger than the sum of its proper divisors (59692455).

91722393 is a wasteful number, since it uses less digits than its factorization.

91722393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1455924 (or 1455921 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 91722393 is about 9577.1808482455. The cubic root of 91722393 is about 450.9812218605.

The spelling of 91722393 in words is "ninety-one million, seven hundred twenty-two thousand, three hundred ninety-three".