231985 has 16 divisors (see below), whose sum is σ = 310464. Its totient is φ = 165312.

The previous prime is 231967. The next prime is 232003. The reversal of 231985 is 589132.

It is an interprime number because it is at equal distance from previous prime (231967) and next prime (232003).

It is a cyclic number.

It is not a de Polignac number, because 231985 - 2¹¹ = 229937 is a prime.

It is a Duffinian number.

Its product of digits (2160) is a multiple of the sum of its prime divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2754 + ... + 2836.

It is an arithmetic number, because the mean of its divisors is an integer number (19404).

2²³¹⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

231985 is a deficient number, since it is larger than the sum of its proper divisors (78479).

231985 is a wasteful number, since it uses less digits than its factorization.

231985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144.

The product of its digits is 2160, while the sum is 28.

The square root of 231985 is about 481.6482118725. The cubic root of 231985 is about 61.4450122107.

The spelling of 231985 in words is "two hundred thirty-one thousand, nine hundred eighty-five".