13449209 has 2 divisors, whose sum is σ = 13449210. Its totient is φ = 13449208.

The previous prime is 13449199. The next prime is 13449211. The reversal of 13449209 is 90294431.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12075625 + 1373584 = 3475^2 + 1172^2 .

It is an emirp because it is prime and its reverse (90294431) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13449209 is a prime.

Together with 13449211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13449259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6724604 + 6724605.

It is an arithmetic number, because the mean of its divisors is an integer number (6724605).

Almost surely, 2^13449209 is an apocalyptic number.

It is an amenable number.

13449209 is a deficient number, since it is larger than the sum of its proper divisors (1).

13449209 is an equidigital number, since it uses as much as digits as its factorization.

13449209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 13449209 is about 3667.3163212355. The cubic root of 13449209 is about 237.8111688646.

The spelling of 13449209 in words is "thirteen million, four hundred forty-nine thousand, two hundred nine".