13216909 has 2 divisors, whose sum is σ = 13216910. Its totient is φ = 13216908.

The previous prime is 13216901. The next prime is 13216919. The reversal of 13216909 is 90961231.

13216909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12320100 + 896809 = 3510^2 + 947^2 .

It is a cyclic number.

It is not a de Polignac number, because 13216909 - 2³ = 13216901 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13216901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6608454 + 6608455.

It is an arithmetic number, because the mean of its divisors is an integer number (6608455).

Almost surely, 2^13216909 is an apocalyptic number.

It is an amenable number.

13216909 is a deficient number, since it is larger than the sum of its proper divisors (1).

13216909 is an equidigital number, since it uses as much as digits as its factorization.

13216909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 13216909 is about 3635.5067047112. The cubic root of 13216909 is about 236.4340200963.

The spelling of 13216909 in words is "thirteen million, two hundred sixteen thousand, nine hundred nine".