561606 has 8 divisors (see below), whose sum is σ = 1123224. Its totient is φ = 187200.

The previous prime is 561599. The next prime is 561607. The reversal of 561606 is 606165.

It is a sphenic number, since it is the product of 3 distinct primes.

561606 is an admirable number.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561607) by changing a digit.

561606 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46795 + ... + 46806.

It is an arithmetic number, because the mean of its divisors is an integer number (140403).

2⁵⁶¹⁶⁰⁶ is an apocalyptic number.

561606 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561606 is a wasteful number, since it uses less digits than its factorization.

561606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93606.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 561606 is about 749.4037630010. The cubic root of 561606 is about 82.5044258415.

The spelling of 561606 in words is "five hundred sixty-one thousand, six hundred six".