23172991329 has 24 divisors (see below), whose sum is σ = 32834922208. Its totient is φ = 14534069760.

The previous prime is 23172991327. The next prime is 23172991379. The reversal of 23172991329 is 92319927132.

It is not a de Polignac number, because 23172991329 - 2¹ = 23172991327 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23172991327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3383949 + ... + 3390789.

Almost surely, 2^23172991329 is an apocalyptic number.

It is an amenable number.

23172991329 is a deficient number, since it is larger than the sum of its proper divisors (9661930879).

23172991329 is a wasteful number, since it uses less digits than its factorization.

23172991329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10785 (or 10768 counting only the distinct ones).

The product of its digits is 367416, while the sum is 48.

The spelling of 23172991329 in words is "twenty-three billion, one hundred seventy-two million, nine hundred ninety-one thousand, three hundred twenty-nine".