231866 has 4 divisors (see below), whose sum is σ = 347802. Its totient is φ = 115932.

The previous prime is 231859. The next prime is 231871. The reversal of 231866 is 668132.

231866 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 225625 + 6241 = 475^2 + 79^2 .

It is a nialpdrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57965 + ... + 57968.

2²³¹⁸⁶⁶ is an apocalyptic number.

231866 is a deficient number, since it is larger than the sum of its proper divisors (115936).

231866 is a wasteful number, since it uses less digits than its factorization.

231866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115935.

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

The square root of 231866 is about 481.5246618814. The cubic root of 231866 is about 61.4345040499.

Adding to 231866 its reverse (668132), we get a palindrome (899998).

The spelling of 231866 in words is "two hundred thirty-one thousand, eight hundred sixty-six".