13645909 has 2 divisors, whose sum is σ = 13645910. Its totient is φ = 13645908.

The previous prime is 13645897. The next prime is 13645937. The reversal of 13645909 is 90954631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11410884 + 2235025 = 3378^2 + 1495^2 .

It is an emirp because it is prime and its reverse (90954631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13645909 - 2¹³ = 13637717 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 (13645609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6822954 + 6822955.

It is an arithmetic number, because the mean of its divisors is an integer number (6822955).

Almost surely, 2^13645909 is an apocalyptic number.

It is an amenable number.

13645909 is a deficient number, since it is larger than the sum of its proper divisors (1).

13645909 is an equidigital number, since it uses as much as digits as its factorization.

13645909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 13645909 is about 3694.0369516289. The cubic root of 13645909 is about 238.9649231039.

The spelling of 13645909 in words is "thirteen million, six hundred forty-five thousand, nine hundred nine".