231668 has 6 divisors (see below), whose sum is σ = 405426. Its totient is φ = 115832.

The previous prime is 231661. The next prime is 231677. The reversal of 231668 is 866132.

231668 is digitally balanced in base 2, 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., 209764 + 21904 = 458^2 + 148^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231661) by changing a digit.

231668 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28955 + ... + 28962.

It is an arithmetic number, because the mean of its divisors is an integer number (67571).

2²³¹⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

231668 is a deficient number, since it is larger than the sum of its proper divisors (173758).

231668 is a wasteful number, since it uses less digits than its factorization.

231668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57921 (or 57919 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 231668 is about 481.3190210245. The cubic root of 231668 is about 61.4170119123.

It can be divided in two parts, 2 and 31668, that multiplied together give a palindrome (63336).

The spelling of 231668 in words is "two hundred thirty-one thousand, six hundred sixty-eight".