231243234320 has 120 divisors (see below), whose sum is σ = 626867549784. Its totient is φ = 79099711488.

The previous prime is 231243234311. The next prime is 231243234323. The reversal of 231243234320 is 23432342132.

It can be written as a sum of positive squares in 4 ways, for example, as 1698758656 + 229544475664 = 41216^2 + 479108^2 .

It is not an unprimeable number, because it can be changed into a prime (231243234323) 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, 1629242 + ... + 1765478.

Almost surely, 2^231243234320 is an apocalyptic number.

231243234320 is a gapful number since it is divisible by the number (20) 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 231243234320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (313433774892).

231243234320 is an abundant number, since it is smaller than the sum of its proper divisors (395624315464).

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

231243234320 is a wasteful number, since it uses less digits than its factorization.

231243234320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136697 (or 136684 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 29.

Adding to 231243234320 its reverse (23432342132), we get a palindrome (254675576452).

The spelling of 231243234320 in words is "two hundred thirty-one billion, two hundred forty-three million, two hundred thirty-four thousand, three hundred twenty".