561622217 has 16 divisors (see below), whose sum is σ = 641990160. Its totient is φ = 486715392.

The previous prime is 561622213. The next prime is 561622219. The reversal of 561622217 is 712226165.

561622217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 131308681 + 430313536 = 11459^2 + 20744^2 .

It is a cyclic number.

It is not a de Polignac number, because 561622217 - 2² = 561622213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561622213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92759 + ... + 98627.

It is an arithmetic number, because the mean of its divisors is an integer number (40124385).

Almost surely, 2^561622217 is an apocalyptic number.

It is an amenable number.

561622217 is a deficient number, since it is larger than the sum of its proper divisors (80367943).

561622217 is a wasteful number, since it uses less digits than its factorization.

561622217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6332.

The product of its digits is 10080, while the sum is 32.

The square root of 561622217 is about 23698.5699357577. The cubic root of 561622217 is about 825.0521996968.

The spelling of 561622217 in words is "five hundred sixty-one million, six hundred twenty-two thousand, two hundred seventeen".