1311231224 has 16 divisors (see below), whose sum is σ = 2458980720. Its totient is φ = 655503040.

The previous prime is 1311231221. The next prime is 1311231253. The reversal of 1311231224 is 4221321131.

It is a junction number, because it is equal to n+sod(n) for n = 1311231196 and 1311231205.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55892 + ... + 75804.

It is an arithmetic number, because the mean of its divisors is an integer number (153686295).

Almost surely, 2^1311231224 is an apocalyptic number.

It is an amenable number.

1311231224 is a deficient number, since it is larger than the sum of its proper divisors (1147749496).

1311231224 is a wasteful number, since it uses less digits than its factorization.

1311231224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28150 (or 28146 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The square root of 1311231224 is about 36210.9268591678. The cubic root of 1311231224 is about 1094.5268694009.

Adding to 1311231224 its reverse (4221321131), we get a palindrome (5532552355).

The spelling of 1311231224 in words is "one billion, three hundred eleven million, two hundred thirty-one thousand, two hundred twenty-four".