231132312 has 64 divisors (see below), whose sum is σ = 651657600. Its totient is φ = 75889440.

The previous prime is 231132299. The next prime is 231132337. The reversal of 231132312 is 213231132.

231132312 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6487 + ... + 22457.

It is an arithmetic number, because the mean of its divisors is an integer number (10182150).

Almost surely, 2^231132312 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 231132312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (325828800).

231132312 is an abundant number, since it is smaller than the sum of its proper divisors (420525288).

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

231132312 is a wasteful number, since it uses less digits than its factorization.

231132312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16053 (or 16043 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 231132312 is about 15203.0362756918. The cubic root of 231132312 is about 613.6963700870.

Adding to 231132312 its reverse (213231132), we get a palindrome (444363444).

It can be divided in two parts, 23113 and 2312, that added together give a triangular number (25425 = T₂₂₅).

The spelling of 231132312 in words is "two hundred thirty-one million, one hundred thirty-two thousand, three hundred twelve".