1318643819 has 8 divisors (see below), whose sum is σ = 1324618848. Its totient is φ = 1312678080.

The previous prime is 1318643813. The next prime is 1318643861. The reversal of 1318643819 is 9183468131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1318643819 - 2²⁰ = 1317595243 is a prime.

It is a super-2 number, since 2×1318643819² = 3477643042773809522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1318643819.

It is not an unprimeable number, because it can be changed into a prime (1318643813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 576959 + ... + 579239.

It is an arithmetic number, because the mean of its divisors is an integer number (165577356).

Almost surely, 2^1318643819 is an apocalyptic number.

1318643819 is a deficient number, since it is larger than the sum of its proper divisors (5975029).

1318643819 is a wasteful number, since it uses less digits than its factorization.

1318643819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4645.

The product of its digits is 124416, while the sum is 44.

The square root of 1318643819 is about 36313.1356261064. The cubic root of 1318643819 is about 1096.5855054706.

The spelling of 1318643819 in words is "one billion, three hundred eighteen million, six hundred forty-three thousand, eight hundred nineteen".