13551809 has 2 divisors, whose sum is σ = 13551810. Its totient is φ = 13551808.

The previous prime is 13551803. The next prime is 13551817. The reversal of 13551809 is 90815531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13542400 + 9409 = 3680^2 + 97^2 .

It is an emirp because it is prime and its reverse (90815531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13551809 - 2²⁰ = 12503233 is a prime.

It is not a weakly prime, because it can be changed into another prime (13551803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6775904 + 6775905.

It is an arithmetic number, because the mean of its divisors is an integer number (6775905).

Almost surely, 2^13551809 is an apocalyptic number.

It is an amenable number.

13551809 is a deficient number, since it is larger than the sum of its proper divisors (1).

13551809 is an equidigital number, since it uses as much as digits as its factorization.

13551809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 13551809 is about 3681.2781747648. The cubic root of 13551809 is about 238.4143677154.

The spelling of 13551809 in words is "thirteen million, five hundred fifty-one thousand, eight hundred nine".