1311994012 has 54 divisors (see below), whose sum is σ = 2723331408. Its totient is φ = 551442528.

The previous prime is 1311994007. The next prime is 1311994043. The reversal of 1311994012 is 2104991131.

It is a super-2 number, since 2×1311994012² = 3442656575047712288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 549373 + ... + 551755.

Almost surely, 2^1311994012 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 1311994012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1361665704).

1311994012 is an abundant number, since it is smaller than the sum of its proper divisors (1411337396).

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

1311994012 is a wasteful number, since it uses less digits than its factorization.

1311994012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2507 (or 2445 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1311994012 is about 36221.4578944581. The cubic root of 1311994012 is about 1094.7390694827.

The spelling of 1311994012 in words is "one billion, three hundred eleven million, nine hundred ninety-four thousand, twelve".