13812209 has 2 divisors, whose sum is σ = 13812210. Its totient is φ = 13812208.

The previous prime is 13812199. The next prime is 13812217. The reversal of 13812209 is 90221831.

13812209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13667809 + 144400 = 3697^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 13812209 - 2⁴ = 13812193 is a prime.

It is not a weakly prime, because it can be changed into another prime (13812229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6906104 + 6906105.

It is an arithmetic number, because the mean of its divisors is an integer number (6906105).

Almost surely, 2^13812209 is an apocalyptic number.

It is an amenable number.

13812209 is a deficient number, since it is larger than the sum of its proper divisors (1).

13812209 is an equidigital number, since it uses as much as digits as its factorization.

13812209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 13812209 is about 3716.4780370668. The cubic root of 13812209 is about 239.9317456371.

The spelling of 13812209 in words is "thirteen million, eight hundred twelve thousand, two hundred nine".