231331332 has 24 divisors (see below), whose sum is σ = 563242176. Its totient is φ = 73757728.

The previous prime is 231331319. The next prime is 231331333. The reversal of 231331332 is 233133132.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 231331299 and 231331308.

It is not an unprimeable number, because it can be changed into a prime (231331333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418803 + ... + 419354.

It is an arithmetic number, because the mean of its divisors is an integer number (23468424).

Almost surely, 2^231331332 is an apocalyptic number.

It is an amenable number.

231331332 is an abundant number, since it is smaller than the sum of its proper divisors (331910844).

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

231331332 is a wasteful number, since it uses less digits than its factorization.

231331332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838187 (or 838185 counting only the distinct ones).

The product of its digits is 972, while the sum is 21.

The square root of 231331332 is about 15209.5802703428. The cubic root of 231331332 is about 613.8724637583.

Adding to 231331332 its reverse (233133132), we get a palindrome (464464464).

The spelling of 231331332 in words is "two hundred thirty-one million, three hundred thirty-one thousand, three hundred thirty-two".