23172191999 has 6 divisors (see below), whose sum is σ = 25470260760. Its totient is φ = 21065628980.

The previous prime is 23172191993. The next prime is 23172192079. The reversal of 23172191999 is 99919127132.

It is not a de Polignac number, because 23172191999 - 2⁸ = 23172191743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23172191999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23172191993) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 95752739 + ... + 95752980.

It is an arithmetic number, because the mean of its divisors is an integer number (4245043460).

Almost surely, 2^23172191999 is an apocalyptic number.

23172191999 is a deficient number, since it is larger than the sum of its proper divisors (2298068761).

23172191999 is a wasteful number, since it uses less digits than its factorization.

23172191999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191505741 (or 191505730 counting only the distinct ones).

The product of its digits is 551124, while the sum is 53.

The spelling of 23172191999 in words is "twenty-three billion, one hundred seventy-two million, one hundred ninety-one thousand, nine hundred ninety-nine".