1311322012 has 144 divisors (see below), whose sum is σ = 3269969920. Its totient is φ = 446497920.

The previous prime is 1311322009. The next prime is 1311322021. The reversal of 1311322012 is 2102231131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 836053 + ... + 837619.

Almost surely, 2^1311322012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311322012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1634984960).

1311322012 is an abundant number, since it is smaller than the sum of its proper divisors (1958647908).

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

1311322012 is a wasteful number, since it uses less digits than its factorization.

1311322012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632 (or 1619 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1311322012 is about 36212.1804369745. The cubic root of 1311322012 is about 1094.5521300390.

Adding to 1311322012 its reverse (2102231131), we get a palindrome (3413553143).

It can be divided in two parts, 1311 and 322012, that added together give a palindrome (323323).

The spelling of 1311322012 in words is "one billion, three hundred eleven million, three hundred twenty-two thousand, twelve".