231132222 has 12 divisors (see below), whose sum is σ = 500786520. Its totient is φ = 77044068.

The previous prime is 231132217. The next prime is 231132257. The reversal of 231132222 is 222231132.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 12840679 = 231132222 / (2 + 3 + 1 + 1 + 3 + 2 + 2 + 2 + 2).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 231132195 and 231132204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6420322 + ... + 6420357.

It is an arithmetic number, because the mean of its divisors is an integer number (41732210).

Almost surely, 2^231132222 is an apocalyptic number.

231132222 is an abundant number, since it is smaller than the sum of its proper divisors (269654298).

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

231132222 is a wasteful number, since it uses less digits than its factorization.

231132222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12840687 (or 12840684 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 231132222 is about 15203.0333157564. The cubic root of 231132222 is about 613.6962904318.

Adding to 231132222 its reverse (222231132), we get a palindrome (453363354).

The spelling of 231132222 in words is "two hundred thirty-one million, one hundred thirty-two thousand, two hundred twenty-two".