231685 has 4 divisors (see below), whose sum is σ = 278028. Its totient is φ = 185344.

The previous prime is 231677. The next prime is 231701. The reversal of 231685 is 586132.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 91809 + 139876 = 303^2 + 374^2 .

It is a cyclic number.

It is not a de Polignac number, because 231685 - 2³ = 231677 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23164 + ... + 23173.

It is an arithmetic number, because the mean of its divisors is an integer number (69507).

2²³¹⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

231685 is a deficient number, since it is larger than the sum of its proper divisors (46343).

231685 is an equidigital number, since it uses as much as digits as its factorization.

231685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46342.

The product of its digits is 1440, while the sum is 25.

The square root of 231685 is about 481.3366805054. The cubic root of 231685 is about 61.4185141535.

It can be divided in two parts, 2316 and 85, that added together give a 4-th power (2401 = 7⁴).

The spelling of 231685 in words is "two hundred thirty-one thousand, six hundred eighty-five".