231321612 has 12 divisors (see below), whose sum is σ = 539750456. Its totient is φ = 77107200.

The previous prime is 231321593. The next prime is 231321641. The reversal of 231321612 is 216123132.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9638389 + ... + 9638412.

Almost surely, 2^231321612 is an apocalyptic number.

It is an amenable number.

231321612 is an abundant number, since it is smaller than the sum of its proper divisors (308428844).

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

231321612 is a wasteful number, since it uses less digits than its factorization.

231321612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19276808 (or 19276806 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

The square root of 231321612 is about 15209.2607315412. The cubic root of 231321612 is about 613.8638658108.

Adding to 231321612 its reverse (216123132), we get a palindrome (447444744).

The spelling of 231321612 in words is "two hundred thirty-one million, three hundred twenty-one thousand, six hundred twelve".