1311643879 has 16 divisors (see below), whose sum is σ = 1616876352. Its totient is φ = 1036147968.

The previous prime is 1311643843. The next prime is 1311643939. The reversal of 1311643879 is 9783461131.

It is a cyclic number.

It is not a de Polignac number, because 1311643879 - 2¹⁹ = 1311119591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311643079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48387 + ... + 70459.

It is an arithmetic number, because the mean of its divisors is an integer number (101054772).

Almost surely, 2^1311643879 is an apocalyptic number.

1311643879 is a deficient number, since it is larger than the sum of its proper divisors (305232473).

1311643879 is a wasteful number, since it uses less digits than its factorization.

1311643879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22746.

The product of its digits is 108864, while the sum is 43.

The square root of 1311643879 is about 36216.6243457338. The cubic root of 1311643879 is about 1094.6416761578.

The spelling of 1311643879 in words is "one billion, three hundred eleven million, six hundred forty-three thousand, eight hundred seventy-nine".