561205306 has 8 divisors (see below), whose sum is σ = 841932180. Its totient is φ = 280561248.

The previous prime is 561205301. The next prime is 561205319. The reversal of 561205306 is 603502165.

It can be written as a sum of positive squares in 2 ways, for example, as 525097225 + 36108081 = 22915^2 + 6009^2 .

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

It is not an unprimeable number, because it can be changed into a prime (561205301) 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, 640 + ... + 33508.

Almost surely, 2^561205306 is an apocalyptic number.

561205306 is a deficient number, since it is larger than the sum of its proper divisors (280726874).

561205306 is a wasteful number, since it uses less digits than its factorization.

561205306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41408.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 561205306 is about 23689.7721812600. The cubic root of 561205306 is about 824.8479945232.

The spelling of 561205306 in words is "five hundred sixty-one million, two hundred five thousand, three hundred six".