1318990209 has 16 divisors (see below), whose sum is σ = 1837321920. Its totient is φ = 840593600.

The previous prime is 1318990199. The next prime is 1318990219. The reversal of 1318990209 is 9020998131.

It is an interprime number because it is at equal distance from previous prime (1318990199) and next prime (1318990219).

It is a cyclic number.

It is not a de Polignac number, because 1318990209 - 2⁴ = 1318990193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1318990219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66267 + ... + 83840.

It is an arithmetic number, because the mean of its divisors is an integer number (114832620).

Almost surely, 2^1318990209 is an apocalyptic number.

It is an amenable number.

1318990209 is a deficient number, since it is larger than the sum of its proper divisors (518331711).

1318990209 is a wasteful number, since it uses less digits than its factorization.

1318990209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150240.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 1318990209 is about 36317.9047991483. The cubic root of 1318990209 is about 1096.6815164865.

The spelling of 1318990209 in words is "one billion, three hundred eighteen million, nine hundred ninety thousand, two hundred nine".