23171978331 has 12 divisors (see below), whose sum is σ = 34249022808. Its totient is φ = 15088729824.

The previous prime is 23171978321. The next prime is 23171978411. The reversal of 23171978331 is 13387917132.

23171978331 is a `hidden beast` number, since 231 + 7 + 19 + 78 + 331 = 666.

It is not a de Polignac number, because 23171978331 - 2⁹ = 23171977819 is a prime.

It is a super-2 number, since 2×23171978331² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23171978311) 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, 29937570 + ... + 29938343.

It is an arithmetic number, because the mean of its divisors is an integer number (2854085234).

Almost surely, 2^23171978331 is an apocalyptic number.

23171978331 is a deficient number, since it is larger than the sum of its proper divisors (11077044477).

23171978331 is a wasteful number, since it uses less digits than its factorization.

23171978331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59875962 (or 59875959 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The spelling of 23171978331 in words is "twenty-three billion, one hundred seventy-one million, nine hundred seventy-eight thousand, three hundred thirty-one".