91573873 has 8 divisors (see below), whose sum is σ = 92379560. Its totient is φ = 90771840.

The previous prime is 91573831. The next prime is 91573897. The reversal of 91573873 is 37837519.

It can be written as a sum of positive squares in 4 ways, for example, as 15936064 + 75637809 = 3992^2 + 8697^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91573873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91570873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73411 + ... + 74647.

It is an arithmetic number, because the mean of its divisors is an integer number (11547445).

Almost surely, 2^91573873 is an apocalyptic number.

It is an amenable number.

91573873 is a deficient number, since it is larger than the sum of its proper divisors (805687).

91573873 is a wasteful number, since it uses less digits than its factorization.

91573873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1827.

The product of its digits is 158760, while the sum is 43.

The square root of 91573873 is about 9569.4238593554. The cubic root of 91573873 is about 450.7376756795.

The spelling of 91573873 in words is "ninety-one million, five hundred seventy-three thousand, eight hundred seventy-three".