1316818947 has 4 divisors (see below), whose sum is σ = 1755758600. Its totient is φ = 877879296.

The previous prime is 1316818907. The next prime is 1316818949. The reversal of 1316818947 is 7498186131.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1316818947 - 2⁷ = 1316818819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1316818896 and 1316818905.

It is not an unprimeable number, because it can be changed into a prime (1316818949) 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, 219469822 + ... + 219469827.

It is an arithmetic number, because the mean of its divisors is an integer number (438939650).

Almost surely, 2^1316818947 is an apocalyptic number.

1316818947 is a deficient number, since it is larger than the sum of its proper divisors (438939653).

1316818947 is an equidigital number, since it uses as much as digits as its factorization.

1316818947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438939652.

The product of its digits is 290304, while the sum is 48.

The square root of 1316818947 is about 36288.0000413360. Note that the first 4 decimals coincide. The cubic root of 1316818947 is about 1096.0794168193.

The spelling of 1316818947 in words is "one billion, three hundred sixteen million, eight hundred eighteen thousand, nine hundred forty-seven".