1318985609 has 2 divisors, whose sum is σ = 1318985610. Its totient is φ = 1318985608.

The previous prime is 1318985599. The next prime is 1318985639. The reversal of 1318985609 is 9065898131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1145484025 + 173501584 = 33845^2 + 13172^2 .

It is a cyclic number.

It is not a de Polignac number, because 1318985609 - 2⁴ = 1318985593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1318985639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659492804 + 659492805.

It is an arithmetic number, because the mean of its divisors is an integer number (659492805).

Almost surely, 2^1318985609 is an apocalyptic number.

It is an amenable number.

1318985609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318985609 is an equidigital number, since it uses as much as digits as its factorization.

1318985609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 50.

The square root of 1318985609 is about 36317.8414694486. The cubic root of 1318985609 is about 1096.6802415867.

The spelling of 1318985609 in words is "one billion, three hundred eighteen million, nine hundred eighty-five thousand, six hundred nine".