231133220 has 24 divisors (see below), whose sum is σ = 485669184. Its totient is φ = 92398176.

The previous prime is 231133211. The next prime is 231133237. The reversal of 231133220 is 22331132.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55739 + ... + 59741.

It is an arithmetic number, because the mean of its divisors is an integer number (20236216).

Almost surely, 2^231133220 is an apocalyptic number.

231133220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231133220 is an abundant number, since it is smaller than the sum of its proper divisors (254535964).

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

231133220 is a wasteful number, since it uses less digits than its factorization.

231133220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6899 (or 6897 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 231133220 is about 15203.0661381183. The cubic root of 231133220 is about 613.6971737184.

Adding to 231133220 its reverse (22331132), we get a palindrome (253464352).

The spelling of 231133220 in words is "two hundred thirty-one million, one hundred thirty-three thousand, two hundred twenty".