1313891764 has 12 divisors (see below), whose sum is σ = 2307860100. Its totient is φ = 654503168.

The previous prime is 1313891737. The next prime is 1313891779. The reversal of 1313891764 is 4671983131.

It can be written as a sum of positive squares in 2 ways, for example, as 816244900 + 497646864 = 28570^2 + 22308^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1313891764.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609469 + ... + 611620.

It is an arithmetic number, because the mean of its divisors is an integer number (192321675).

Almost surely, 2^1313891764 is an apocalyptic number.

It is an amenable number.

1313891764 is a deficient number, since it is larger than the sum of its proper divisors (993968336).

1313891764 is a wasteful number, since it uses less digits than its factorization.

1313891764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221362 (or 1221360 counting only the distinct ones).

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

The square root of 1313891764 is about 36247.6449441891. The cubic root of 1313891764 is about 1095.2666487111.

The spelling of 1313891764 in words is "one billion, three hundred thirteen million, eight hundred ninety-one thousand, seven hundred sixty-four".