231331144 has 32 divisors (see below), whose sum is σ = 489499200. Its totient is φ = 101523520.

The previous prime is 231331117. The next prime is 231331147. The reversal of 231331144 is 441133132.

231331144 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (231331147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42772 + ... + 47875.

It is an arithmetic number, because the mean of its divisors is an integer number (15296850).

Almost surely, 2^231331144 is an apocalyptic number.

It is an amenable number.

231331144 is an abundant number, since it is smaller than the sum of its proper divisors (258168056).

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

231331144 is a wasteful number, since it uses less digits than its factorization.

231331144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90693 (or 90689 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 231331144 is about 15209.5740900263. The cubic root of 231331144 is about 613.8722974628.

Adding to 231331144 its reverse (441133132), we get a palindrome (672464276).

The spelling of 231331144 in words is "two hundred thirty-one million, three hundred thirty-one thousand, one hundred forty-four".