1311943564 has 12 divisors (see below), whose sum is σ = 2307556944. Its totient is φ = 652641584.

The previous prime is 1311943561. The next prime is 1311943579. The reversal of 1311943564 is 4653491131.

It is not an unprimeable number, because it can be changed into a prime (1311943561) 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, 831664 + ... + 833239.

It is an arithmetic number, because the mean of its divisors is an integer number (192296412).

Almost surely, 2^1311943564 is an apocalyptic number.

It is an amenable number.

1311943564 is a deficient number, since it is larger than the sum of its proper divisors (995613380).

1311943564 is a wasteful number, since it uses less digits than its factorization.

1311943564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1665104 (or 1665102 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The square root of 1311943564 is about 36220.7615049712. The cubic root of 1311943564 is about 1094.7250378880.

The spelling of 1311943564 in words is "one billion, three hundred eleven million, nine hundred forty-three thousand, five hundred sixty-four".