13550909 has 2 divisors, whose sum is σ = 13550910. Its totient is φ = 13550908.

The previous prime is 13550903. The next prime is 13550941. The reversal of 13550909 is 90905531.

It is an a-pointer prime, because the next prime (13550941) can be obtained adding 13550909 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10745284 + 2805625 = 3278^2 + 1675^2 .

It is an emirp because it is prime and its reverse (90905531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13550909 - 2⁴ = 13550893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13550903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6775454 + 6775455.

It is an arithmetic number, because the mean of its divisors is an integer number (6775455).

Almost surely, 2^13550909 is an apocalyptic number.

It is an amenable number.

13550909 is a deficient number, since it is larger than the sum of its proper divisors (1).

13550909 is an equidigital number, since it uses as much as digits as its factorization.

13550909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6075, while the sum is 32.

The square root of 13550909 is about 3681.1559325842. The cubic root of 13550909 is about 238.4090897563.

The spelling of 13550909 in words is "thirteen million, five hundred fifty thousand, nine hundred nine".