13604609 has 2 divisors, whose sum is σ = 13604610. Its totient is φ = 13604608.

The previous prime is 13604603. The next prime is 13604611. The reversal of 13604609 is 90640631.

13604609 is digitally balanced in base 2 and base 3, because in such bases 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., 13162384 + 442225 = 3628^2 + 665^2 .

It is a cyclic number.

It is not a de Polignac number, because 13604609 - 2⁴ = 13604593 is a prime.

It is a Sophie Germain prime.

Together with 13604611, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13604603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6802304 + 6802305.

It is an arithmetic number, because the mean of its divisors is an integer number (6802305).

Almost surely, 2^13604609 is an apocalyptic number.

It is an amenable number.

13604609 is a deficient number, since it is larger than the sum of its proper divisors (1).

13604609 is an equidigital number, since it uses as much as digits as its factorization.

13604609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 13604609 is about 3688.4426252824. The cubic root of 13604609 is about 238.7235998695.

The spelling of 13604609 in words is "thirteen million, six hundred four thousand, six hundred nine".