231663312 has 30 divisors (see below), whose sum is σ = 648335922. Its totient is φ = 77221056.

The previous prime is 231663293. The next prime is 231663319. The reversal of 231663312 is 213366132.

It is a happy number.

231663312 is a `hidden beast` number, since 2 + 3 + 16 + 633 + 12 = 666.

It can be written as a sum of positive squares in only one way, i.e., 229340736 + 2322576 = 15144^2 + 1524^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231663319) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 804243 + ... + 804530.

Almost surely, 2^231663312 is an apocalyptic number.

It is an amenable number.

231663312 is an abundant number, since it is smaller than the sum of its proper divisors (416672610).

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

231663312 is a wasteful number, since it uses less digits than its factorization.

231663312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608787 (or 1608778 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 231663312 is about 15220.4898738510. The cubic root of 231663312 is about 614.1659763426.

The spelling of 231663312 in words is "two hundred thirty-one million, six hundred sixty-three thousand, three hundred twelve".