1318813793 has 4 divisors (see below), whose sum is σ = 1438705968. Its totient is φ = 1198921620.

The previous prime is 1318813789. The next prime is 1318813801. The reversal of 1318813793 is 3973188131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1318813793 - 2² = 1318813789 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1318813723) 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, 59946071 + ... + 59946092.

It is an arithmetic number, because the mean of its divisors is an integer number (359676492).

Almost surely, 2^1318813793 is an apocalyptic number.

It is an amenable number.

1318813793 is a deficient number, since it is larger than the sum of its proper divisors (119892175).

1318813793 is a wasteful number, since it uses less digits than its factorization.

1318813793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119892174.

The product of its digits is 108864, while the sum is 44.

The square root of 1318813793 is about 36315.4759434597. The cubic root of 1318813793 is about 1096.6326202952.

The spelling of 1318813793 in words is "one billion, three hundred eighteen million, eight hundred thirteen thousand, seven hundred ninety-three".