231666172 has 6 divisors (see below), whose sum is σ = 405415808. Its totient is φ = 115833084.

The previous prime is 231666137. The next prime is 231666173. The reversal of 231666172 is 271666132.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231666173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28958268 + ... + 28958275.

Almost surely, 2^231666172 is an apocalyptic number.

It is an amenable number.

231666172 is a deficient number, since it is larger than the sum of its proper divisors (173749636).

231666172 is a wasteful number, since it uses less digits than its factorization.

231666172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57916547 (or 57916545 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 231666172 is about 15220.5838258590. The cubic root of 231666172 is about 614.1685037280.

The spelling of 231666172 in words is "two hundred thirty-one million, six hundred sixty-six thousand, one hundred seventy-two".