1311220412 has 12 divisors (see below), whose sum is σ = 2298111816. Its totient is φ = 654617040.

The previous prime is 1311220399. The next prime is 1311220441. The reversal of 1311220412 is 2140221131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245318 + ... + 250605.

It is an arithmetic number, because the mean of its divisors is an integer number (191509318).

Almost surely, 2^1311220412 is an apocalyptic number.

It is an amenable number.

1311220412 is a deficient number, since it is larger than the sum of its proper divisors (986891404).

1311220412 is a wasteful number, since it uses less digits than its factorization.

1311220412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496588 (or 496586 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1311220412 is about 36210.7775669068. Note that the first 3 decimals coincide. The cubic root of 1311220412 is about 1094.5238610179.

Adding to 1311220412 its reverse (2140221131), we get a palindrome (3451441543).

The spelling of 1311220412 in words is "one billion, three hundred eleven million, two hundred twenty thousand, four hundred twelve".