231212232 has 80 divisors (see below), whose sum is σ = 649806300. Its totient is φ = 76809600.

The previous prime is 231212231. The next prime is 231212269. The reversal of 231212232 is 232212132.

It can be written as a sum of positive squares in 2 ways, for example, as 200675556 + 30536676 = 14166^2 + 5526^2 .

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.

It is not an unprimeable number, because it can be changed into a prime (231212231) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 329482 + ... + 330182.

Almost surely, 2^231212232 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 231212232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324903150).

231212232 is an abundant number, since it is smaller than the sum of its proper divisors (418594068).

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

231212232 is a wasteful number, since it uses less digits than its factorization.

231212232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228 (or 1215 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 231212232 is about 15205.6644708477. The cubic root of 231212232 is about 613.7670957556.

Adding to 231212232 its reverse (232212132), we get a palindrome (463424364).

The spelling of 231212232 in words is "two hundred thirty-one million, two hundred twelve thousand, two hundred thirty-two".