231534144 has 168 divisors, whose sum is σ = 698967360. Its totient is φ = 73178112.

The previous prime is 231534143. The next prime is 231534151. The reversal of 231534144 is 441435132.

It is a happy number.

231534144 is a `hidden beast` number, since 2 + 315 + 341 + 4 + 4 = 666.

231534144 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (231534143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1386349 + ... + 1386515.

It is an arithmetic number, because the mean of its divisors is an integer number (4160520).

Almost surely, 2^231534144 is an apocalyptic number.

231534144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231534144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (349483680).

231534144 is an abundant number, since it is smaller than the sum of its proper divisors (467433216).

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

231534144 is a wasteful number, since it uses less digits than its factorization.

231534144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 284 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 231534144 is about 15216.2460547929. The cubic root of 231534144 is about 614.0518087333.

Adding to 231534144 its reverse (441435132), we get a palindrome (672969276).

The spelling of 231534144 in words is "two hundred thirty-one million, five hundred thirty-four thousand, one hundred forty-four".