231331500000 has 252 divisors, whose sum is σ = 822316661712. Its totient is φ = 61687200000.

The previous prime is 231331499983. The next prime is 231331500007. The reversal of 231331500000 is 5133132.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231331500007) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 4474297 + ... + 4525703.

It is an arithmetic number, because the mean of its divisors is an integer number (3263161356).

Almost surely, 2^231331500000 is an apocalyptic number.

231331500000 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 231331500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (411158330856).

231331500000 is an abundant number, since it is smaller than the sum of its proper divisors (590985161712).

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

231331500000 is an frugal number, since it uses more digits than its factorization.

231331500000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51453 (or 51417 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

Adding to 231331500000 its reverse (5133132), we get a palindrome (231336633132).

The spelling of 231331500000 in words is "two hundred thirty-one billion, three hundred thirty-one million, five hundred thousand".