231243132 has 24 divisors (see below), whose sum is σ = 540750672. Its totient is φ = 76912000.

The previous prime is 231243113. The next prime is 231243139. The reversal of 231243132 is 231342132.

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 = 231243099 and 231243108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231243139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15369 + ... + 26432.

It is an arithmetic number, because the mean of its divisors is an integer number (22531278).

Almost surely, 2^231243132 is an apocalyptic number.

It is an amenable number.

231243132 is an abundant number, since it is smaller than the sum of its proper divisors (309507540).

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

231243132 is a wasteful number, since it uses less digits than its factorization.

231243132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42269 (or 42267 counting only the distinct ones).

The product of its digits is 864, while the sum is 21.

The square root of 231243132 is about 15206.6805056199. The cubic root of 231243132 is about 613.7944365214.

Adding to 231243132 its reverse (231342132), we get a palindrome (462585264).

The spelling of 231243132 in words is "two hundred thirty-one million, two hundred forty-three thousand, one hundred thirty-two".