1311231222 has 48 divisors (see below), whose sum is σ = 3301908480. Its totient is φ = 368285616.

The previous prime is 1311231221. The next prime is 1311231253. The reversal of 1311231222 is 2221321131.

It is a super-2 number, since 2×1311231222² = 3438654635095226568, which contains 22 as substring.

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

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 = 1311231195 and 1311231204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311231221) 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, 80758 + ... + 95625.

It is an arithmetic number, because the mean of its divisors is an integer number (68789760).

Almost surely, 2^1311231222 is an apocalyptic number.

1311231222 is an abundant number, since it is smaller than the sum of its proper divisors (1990677258).

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

1311231222 is a wasteful number, since it uses less digits than its factorization.

1311231222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176457 (or 176454 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1311231222 is about 36210.9268315518. The cubic root of 1311231222 is about 1094.5268688444.

Adding to 1311231222 its reverse (2221321131), we get a palindrome (3532552353).

The spelling of 1311231222 in words is "one billion, three hundred eleven million, two hundred thirty-one thousand, two hundred twenty-two".