231331612 has 24 divisors (see below), whose sum is σ = 430370640. Its totient is φ = 108489600.

The previous prime is 231331609. The next prime is 231331619. The reversal of 231331612 is 216133132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231331619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7393 + ... + 22744.

It is an arithmetic number, because the mean of its divisors is an integer number (17932110).

Almost surely, 2^231331612 is an apocalyptic number.

It is an amenable number.

231331612 is a deficient number, since it is larger than the sum of its proper divisors (199039028).

231331612 is a wasteful number, since it uses less digits than its factorization.

231331612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30261 (or 30259 counting only the distinct ones).

The product of its digits is 648, while the sum is 22.

The square root of 231331612 is about 15209.5894750647. The cubic root of 231331612 is about 613.8727114322.

Adding to 231331612 its reverse (216133132), we get a palindrome (447464744).

The spelling of 231331612 in words is "two hundred thirty-one million, three hundred thirty-one thousand, six hundred twelve".