1311977768 has 16 divisors (see below), whose sum is σ = 2485320180. Its totient is φ = 649225728.

The previous prime is 1311977767. The next prime is 1311977789. The reversal of 1311977768 is 8677791131.

It can be written as a sum of positive squares in 2 ways, for example, as 1154776324 + 157201444 = 33982^2 + 12538^2 .

It is not an unprimeable number, because it can be changed into a prime (1311977767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 844571 + ... + 846122.

Almost surely, 2^1311977768 is an apocalyptic number.

It is an amenable number.

1311977768 is a deficient number, since it is larger than the sum of its proper divisors (1173342412).

1311977768 is a wasteful number, since it uses less digits than its factorization.

1311977768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690796 (or 1690792 counting only the distinct ones).

The product of its digits is 444528, while the sum is 50.

The square root of 1311977768 is about 36221.2336620386. The cubic root of 1311977768 is about 1094.7345514197.

The spelling of 1311977768 in words is "one billion, three hundred eleven million, nine hundred seventy-seven thousand, seven hundred sixty-eight".