231213332 has 24 divisors (see below), whose sum is σ = 464021376. Its totient is φ = 98749728.

The previous prime is 231213247. The next prime is 231213361. The reversal of 231213332 is 233312132.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5888 + ... + 22295.

It is an arithmetic number, because the mean of its divisors is an integer number (19334224).

Almost surely, 2^231213332 is an apocalyptic number.

It is an amenable number.

231213332 is an abundant number, since it is smaller than the sum of its proper divisors (232808044).

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

231213332 is a wasteful number, since it uses less digits than its factorization.

231213332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28487 (or 28485 counting only the distinct ones).

The product of its digits is 648, while the sum is 20.

The square root of 231213332 is about 15205.7006415357. The cubic root of 231213332 is about 613.7680690933.

Adding to 231213332 its reverse (233312132), we get a palindrome (464525464).

The spelling of 231213332 in words is "two hundred thirty-one million, two hundred thirteen thousand, three hundred thirty-two".