231231120 has 80 divisors (see below), whose sum is σ = 720912192. Its totient is φ = 61309440.

The previous prime is 231231107. The next prime is 231231131. The reversal of 231231120 is 21132132.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 231231120.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40779 + ... + 46101.

Almost surely, 2^231231120 is an apocalyptic number.

231231120 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 231231120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (360456096).

231231120 is an abundant number, since it is smaller than the sum of its proper divisors (489681072).

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

231231120 is a wasteful number, since it uses less digits than its factorization.

231231120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5520 (or 5514 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 231231120 is about 15206.2855424985. The cubic root of 231231120 is about 613.7838084199.

Adding to 231231120 its reverse (21132132), we get a palindrome (252363252).

The spelling of 231231120 in words is "two hundred thirty-one million, two hundred thirty-one thousand, one hundred twenty".