1311286772 has 12 divisors (see below), whose sum is σ = 2429737380. Its totient is φ = 617076096.

The previous prime is 1311286733. The next prime is 1311286777. The reversal of 1311286772 is 2776821131.

It can be written as a sum of positive squares in 2 ways, for example, as 988222096 + 323064676 = 31436^2 + 17974^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311286777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9641747 + ... + 9641882.

It is an arithmetic number, because the mean of its divisors is an integer number (202478115).

Almost surely, 2^1311286772 is an apocalyptic number.

It is an amenable number.

1311286772 is a deficient number, since it is larger than the sum of its proper divisors (1118450608).

1311286772 is a wasteful number, since it uses less digits than its factorization.

1311286772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19283650 (or 19283648 counting only the distinct ones).

The product of its digits is 28224, while the sum is 38.

The square root of 1311286772 is about 36211.6938570954. The cubic root of 1311286772 is about 1094.5423250833.

The spelling of 1311286772 in words is "one billion, three hundred eleven million, two hundred eighty-six thousand, seven hundred seventy-two".