231912 has 24 divisors (see below), whose sum is σ = 628290. Its totient is φ = 77280.

The previous prime is 231901. The next prime is 231919. The reversal of 231912 is 219132.

It is a happy number.

231912 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 171396 + 60516 = 414^2 + 246^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (231919) by changing a digit.

231912 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1539 + ... + 1682.

2²³¹⁹¹² is an apocalyptic number.

It is an amenable number.

231912 is an abundant number, since it is smaller than the sum of its proper divisors (396378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231912 is a wasteful number, since it uses less digits than its factorization.

231912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3233 (or 3226 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 231912 is about 481.5724244597. The cubic root of 231912 is about 61.4385664542.

The spelling of 231912 in words is "two hundred thirty-one thousand, nine hundred twelve".