231855 has 32 divisors (see below), whose sum is σ = 423360. Its totient is φ = 107520.

The previous prime is 231841. The next prime is 231859. The reversal of 231855 is 558132.

It is not a de Polignac number, because 231855 - 2⁴ = 231839 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5635 + ... + 5675.

It is an arithmetic number, because the mean of its divisors is an integer number (13230).

2²³¹⁸⁵⁵ is an apocalyptic number.

231855 is a deficient number, since it is larger than the sum of its proper divisors (191505).

231855 is a wasteful number, since it uses less digits than its factorization.

231855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91.

The product of its digits is 1200, while the sum is 24.

The square root of 231855 is about 481.5132396934. The cubic root of 231855 is about 61.4335325257.

Adding to 231855 its reverse (558132), we get a palindrome (789987).

The spelling of 231855 in words is "two hundred thirty-one thousand, eight hundred fifty-five".