13320209 has 6 divisors (see below), whose sum is σ = 15494994. Its totient is φ = 11417280.

The previous prime is 13320191. The next prime is 13320217. The reversal of 13320209 is 90202331.

It can be written as a sum of positive squares in only one way, i.e., 13300609 + 19600 = 3647^2 + 140^2 .

It is not a de Polignac number, because 13320209 - 2¹² = 13316113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13320409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 135872 + ... + 135969.

It is an arithmetic number, because the mean of its divisors is an integer number (2582499).

Almost surely, 2^13320209 is an apocalyptic number.

It is an amenable number.

13320209 is a deficient number, since it is larger than the sum of its proper divisors (2174785).

13320209 is an equidigital number, since it uses as much as digits as its factorization.

13320209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271855 (or 271848 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 13320209 is about 3649.6861508902. The cubic root of 13320209 is about 237.0483916686.

The spelling of 13320209 in words is "thirteen million, three hundred twenty thousand, two hundred nine".