5561609 has 4 divisors (see below), whose sum is σ = 5697300. Its totient is φ = 5425920.

The previous prime is 5561599. The next prime is 5561627. The reversal of 5561609 is 9061655.

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 3168400 + 2393209 = 1780^2 + 1547^2 .

It is a cyclic number.

It is not a de Polignac number, because 5561609 - 2⁴ = 5561593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5561629) 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 in 3 ways as a sum of consecutive naturals, for example, 67784 + ... + 67865.

It is an arithmetic number, because the mean of its divisors is an integer number (1424325).

Almost surely, 2^5561609 is an apocalyptic number.

It is an amenable number.

5561609 is a deficient number, since it is larger than the sum of its proper divisors (135691).

5561609 is a wasteful number, since it uses less digits than its factorization.

5561609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135690.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 5561609 is about 2358.3063838272. The cubic root of 5561609 is about 177.1740656265.

The spelling of 5561609 in words is "five million, five hundred sixty-one thousand, six hundred nine".