231216372 has 18 divisors (see below), whose sum is σ = 584463698. Its totient is φ = 77072112.

The previous prime is 231216361. The next prime is 231216389. The reversal of 231216372 is 273612132.

231216372 is a `hidden beast` number, since 2 + 3 + 1 + 21 + 637 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 231161616 + 54756 = 15204^2 + 234^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×231216372² = 106922021361684768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3211303 + ... + 3211374.

Almost surely, 2^231216372 is an apocalyptic number.

It is an amenable number.

231216372 is an abundant number, since it is smaller than the sum of its proper divisors (353247326).

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

231216372 is a wasteful number, since it uses less digits than its factorization.

231216372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6422687 (or 6422682 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 231216372 is about 15205.8006037170. The cubic root of 231216372 is about 613.7707590287.

The spelling of 231216372 in words is "two hundred thirty-one million, two hundred sixteen thousand, three hundred seventy-two".