231918 has 8 divisors (see below), whose sum is σ = 463848. Its totient is φ = 77304.

The previous prime is 231901. The next prime is 231919. The reversal of 231918 is 819132.

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

231918 is an admirable number.

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 (231919) 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 3 ways as a sum of consecutive naturals, for example, 19321 + ... + 19332.

It is an arithmetic number, because the mean of its divisors is an integer number (57981).

2²³¹⁹¹⁸ is an apocalyptic number.

231918 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.

231918 is a wasteful number, since it uses less digits than its factorization.

231918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38658.

The product of its digits is 432, while the sum is 24.

The square root of 231918 is about 481.5786540120. The cubic root of 231918 is about 61.4390962934.

It can be divided in two parts, 2 and 31918, that multiplied together give a palindrome (63836).

The spelling of 231918 in words is "two hundred thirty-one thousand, nine hundred eighteen".