231331312 has 10 divisors (see below), whose sum is σ = 448204448. Its totient is φ = 115665648.

The previous prime is 231331301. The next prime is 231331313. The reversal of 231331312 is 213133132.

It is a self number, because there is not a number n which added to its sum of digits gives 231331312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231331313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7229088 + ... + 7229119.

Almost surely, 2^231331312 is an apocalyptic number.

It is an amenable number.

231331312 is a deficient number, since it is larger than the sum of its proper divisors (216873136).

231331312 is a wasteful number, since it uses less digits than its factorization.

231331312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14458215 (or 14458209 counting only the distinct ones).

The product of its digits is 324, while the sum is 19.

The square root of 231331312 is about 15209.5796128624. The cubic root of 231331312 is about 613.8724460673.

Adding to 231331312 its reverse (213133132), we get a palindrome (444464444).

The spelling of 231331312 in words is "two hundred thirty-one million, three hundred thirty-one thousand, three hundred twelve".