231331131330 has 128 divisors (see below), whose sum is σ = 604782194688. Its totient is φ = 56290090752.

The previous prime is 231331131287. The next prime is 231331131337. The reversal of 231331131330 is 33131133132.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 231331131330.

It is not an unprimeable number, because it can be changed into a prime (231331131337) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20316819 + ... + 20328201.

It is an arithmetic number, because the mean of its divisors is an integer number (4724860896).

Almost surely, 2^231331131330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231331131330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302391097344).

231331131330 is an abundant number, since it is smaller than the sum of its proper divisors (373451063358).

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

231331131330 is a wasteful number, since it uses less digits than its factorization.

231331131330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12000.

The product of its (nonzero) digits is 1458, while the sum is 24.

Adding to 231331131330 its reverse (33131133132), we get a palindrome (264462264462).

The spelling of 231331131330 in words is "two hundred thirty-one billion, three hundred thirty-one million, one hundred thirty-one thousand, three hundred thirty".