13809569 has 2 divisors, whose sum is σ = 13809570. Its totient is φ = 13809568.

The previous prime is 13809557. The next prime is 13809583. The reversal of 13809569 is 96590831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13778944 + 30625 = 3712^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 13809569 - 2⁴ = 13809553 is a prime.

It is a super-2 number, since 2×13809569² = 381408391931522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13809589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6904784 + 6904785.

It is an arithmetic number, because the mean of its divisors is an integer number (6904785).

Almost surely, 2^13809569 is an apocalyptic number.

It is an amenable number.

13809569 is a deficient number, since it is larger than the sum of its proper divisors (1).

13809569 is an equidigital number, since it uses as much as digits as its factorization.

13809569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 13809569 is about 3716.1228451169. The cubic root of 13809569 is about 239.9164581918.

The spelling of 13809569 in words is "thirteen million, eight hundred nine thousand, five hundred sixty-nine".