1231331222 has 48 divisors (see below), whose sum is σ = 2101982400. Its totient is φ = 536461200.

The previous prime is 1231331221. The next prime is 1231331263. The reversal of 1231331222 is 2221331321.

It is a junction number, because it is equal to n+sod(n) for n = 1231331194 and 1231331203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231331221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2938529 + ... + 2938947.

It is an arithmetic number, because the mean of its divisors is an integer number (43791300).

Almost surely, 2^1231331222 is an apocalyptic number.

1231331222 is a deficient number, since it is larger than the sum of its proper divisors (870651178).

1231331222 is a wasteful number, since it uses less digits than its factorization.

1231331222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633 (or 602 counting only the distinct ones).

The product of its digits is 432, while the sum is 20.

The square root of 1231331222 is about 35090.3294655379. The cubic root of 1231331222 is about 1071.8276685880.

Adding to 1231331222 its reverse (2221331321), we get a palindrome (3452662543).

Subtracting 1231331222 from its reverse (2221331321), we obtain a palindrome (990000099).

The spelling of 1231331222 in words is "one billion, two hundred thirty-one million, three hundred thirty-one thousand, two hundred twenty-two".