231031320120 has 160 divisors (see below), whose sum is σ = 776897827200. Its totient is φ = 61578531072.

The previous prime is 231031320119. The next prime is 231031320167. The reversal of 231031320120 is 21023130132.

231031320120 is a `hidden beast` number, since 2 + 310 + 31 + 320 + 1 + 2 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 231031320093 and 231031320102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7134526 + ... + 7166834.

It is an arithmetic number, because the mean of its divisors is an integer number (4855611420).

Almost surely, 2^231031320120 is an apocalyptic number.

231031320120 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 231031320120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (388448913600).

231031320120 is an abundant number, since it is smaller than the sum of its proper divisors (545866507080).

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

231031320120 is a wasteful number, since it uses less digits than its factorization.

231031320120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34539 (or 34526 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 231031320120 its reverse (21023130132), we get a palindrome (252054450252).

The spelling of 231031320120 in words is "two hundred thirty-one billion, thirty-one million, three hundred twenty thousand, one hundred twenty".