231215668 has 6 divisors (see below), whose sum is σ = 404627426. Its totient is φ = 115607832.

The previous prime is 231215659. The next prime is 231215669. The reversal of 231215668 is 866512132.

231215668 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 205692964 + 25522704 = 14342^2 + 5052^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231215669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28901955 + ... + 28901962.

Almost surely, 2^231215668 is an apocalyptic number.

It is an amenable number.

231215668 is a deficient number, since it is larger than the sum of its proper divisors (173411758).

231215668 is a wasteful number, since it uses less digits than its factorization.

231215668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57803921 (or 57803919 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 231215668 is about 15205.7774546387. Note that the first 3 decimals coincide. The cubic root of 231215668 is about 613.7701360984.

The spelling of 231215668 in words is "two hundred thirty-one million, two hundred fifteen thousand, six hundred sixty-eight".