13559561 has 4 divisors (see below), whose sum is σ = 13890324. Its totient is φ = 13228800.

The previous prime is 13559551. The next prime is 13559587. The reversal of 13559561 is 16595531.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 462400 + 13097161 = 680^2 + 3619^2 .

It is a cyclic number.

It is not a de Polignac number, because 13559561 - 2¹⁴ = 13543177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13559551) 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 in 3 ways as a sum of consecutive naturals, for example, 165320 + ... + 165401.

It is an arithmetic number, because the mean of its divisors is an integer number (3472581).

Almost surely, 2^13559561 is an apocalyptic number.

It is an amenable number.

13559561 is a deficient number, since it is larger than the sum of its proper divisors (330763).

13559561 is an equidigital number, since it uses as much as digits as its factorization.

13559561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330762.

The product of its digits is 20250, while the sum is 35.

The square root of 13559561 is about 3682.3309194042. The cubic root of 13559561 is about 238.4598188648.

The spelling of 13559561 in words is "thirteen million, five hundred fifty-nine thousand, five hundred sixty-one".