231666 has 8 divisors (see below), whose sum is σ = 463344. Its totient is φ = 77220.

The previous prime is 231661. The next prime is 231677. The reversal of 231666 is 666132.

231666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

231666 is an admirable number.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 231666.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19300 + ... + 19311.

It is an arithmetic number, because the mean of its divisors is an integer number (57918).

2²³¹⁶⁶⁶ is an apocalyptic number.

231666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

231666 is a wasteful number, since it uses less digits than its factorization.

231666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38616.

The product of its digits is 1296, while the sum is 24.

The square root of 231666 is about 481.3169433959. The cubic root of 231666 is about 61.4168351732.

Adding to 231666 its reverse (666132), we get a palindrome (897798).

The spelling of 231666 in words is "two hundred thirty-one thousand, six hundred sixty-six".