231506172 has 72 divisors (see below), whose sum is σ = 608676432. Its totient is φ = 74131200.

The previous prime is 231506167. The next prime is 231506227. The reversal of 231506172 is 271605132.

It is a happy number.

231506172 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 97722 + ... + 100062.

Almost surely, 2^231506172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231506172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304338216).

231506172 is an abundant number, since it is smaller than the sum of its proper divisors (377170260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231506172 is a wasteful number, since it uses less digits than its factorization.

231506172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2459 (or 2454 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 231506172 is about 15215.3268778558. The cubic root of 231506172 is about 614.0270795528.

The spelling of 231506172 in words is "two hundred thirty-one million, five hundred six thousand, one hundred seventy-two".