91172395873 has 16 divisors (see below), whose sum is σ = 98488406016. Its totient is φ = 83899851840.

The previous prime is 91172395861. The next prime is 91172395877. The reversal of 91172395873 is 37859327119.

It is a cyclic number.

It is not a de Polignac number, because 91172395873 - 2¹³ = 91172387681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91172395877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18753463 + ... + 18758323.

It is an arithmetic number, because the mean of its divisors is an integer number (6155525376).

Almost surely, 2^91172395873 is an apocalyptic number.

It is an amenable number.

91172395873 is a deficient number, since it is larger than the sum of its proper divisors (7316010143).

91172395873 is a wasteful number, since it uses less digits than its factorization.

91172395873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9024.

The product of its digits is 2857680, while the sum is 55.

The spelling of 91172395873 in words is "ninety-one billion, one hundred seventy-two million, three hundred ninety-five thousand, eight hundred seventy-three".