561221606 has 8 divisors (see below), whose sum is σ = 918362664. Its totient is φ = 255100720.

The previous prime is 561221593. The next prime is 561221651. The reversal of 561221606 is 606122165.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12755015 + ... + 12755058.

It is an arithmetic number, because the mean of its divisors is an integer number (114795333).

Almost surely, 2^561221606 is an apocalyptic number.

561221606 is a deficient number, since it is larger than the sum of its proper divisors (357141058).

561221606 is a wasteful number, since it uses less digits than its factorization.

561221606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25510086.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 561221606 is about 23690.1162090860. The cubic root of 561221606 is about 824.8559802472.

The spelling of 561221606 in words is "five hundred sixty-one million, two hundred twenty-one thousand, six hundred six".