1311223122 has 24 divisors (see below), whose sum is σ = 3099255120. Its totient is φ = 397340280.

The previous prime is 1311223093. The next prime is 1311223129. The reversal of 1311223122 is 2213221131.

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 = 1311223095 and 1311223104.

It is not an unprimeable number, because it can be changed into a prime (1311223129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3310972 + ... + 3311367.

It is an arithmetic number, because the mean of its divisors is an integer number (129135630).

Almost surely, 2^1311223122 is an apocalyptic number.

1311223122 is an abundant number, since it is smaller than the sum of its proper divisors (1788031998).

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

1311223122 is a wasteful number, since it uses less digits than its factorization.

1311223122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6622358 (or 6622355 counting only the distinct ones).

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

The square root of 1311223122 is about 36210.8149866860. The cubic root of 1311223122 is about 1094.5246150629.

Adding to 1311223122 its reverse (2213221131), we get a palindrome (3524444253).

The spelling of 1311223122 in words is "one billion, three hundred eleven million, two hundred twenty-three thousand, one hundred twenty-two".