561205 has 4 divisors (see below), whose sum is σ = 673452. Its totient is φ = 448960.

The previous prime is 561199. The next prime is 561229. The reversal of 561205 is 502165.

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 443556 + 117649 = 666^2 + 343^2 .

It is not a de Polignac number, because 561205 - 2⁵ = 561173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56116 + ... + 56125.

It is an arithmetic number, because the mean of its divisors is an integer number (168363).

2⁵⁶¹²⁰⁵ is an apocalyptic number.

It is an amenable number.

561205 is a deficient number, since it is larger than the sum of its proper divisors (112247).

561205 is a wasteful number, since it uses less digits than its factorization.

561205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112246.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 561205 is about 749.1361691976. The cubic root of 561205 is about 82.4847844606.

The spelling of 561205 in words is "five hundred sixty-one thousand, two hundred five".