1318208905 has 16 divisors (see below), whose sum is σ = 1724063040. Its totient is φ = 961714368.

The previous prime is 1318208893. The next prime is 1318208911. The reversal of 1318208905 is 5098028131.

It is a cyclic number.

It is not a de Polignac number, because 1318208905 - 2¹⁷ = 1318077833 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 116775 + ... + 127564.

It is an arithmetic number, because the mean of its divisors is an integer number (107753940).

Almost surely, 2^1318208905 is an apocalyptic number.

It is an amenable number.

1318208905 is a deficient number, since it is larger than the sum of its proper divisors (405854135).

1318208905 is a wasteful number, since it uses less digits than its factorization.

1318208905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244440.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 1318208905 is about 36307.1467482643. The cubic root of 1318208905 is about 1096.4649339097.

The spelling of 1318208905 in words is "one billion, three hundred eighteen million, two hundred eight thousand, nine hundred five".