561991219 has 16 divisors (see below), whose sum is σ = 615720960. Its totient is φ = 510641280.

The previous prime is 561991217. The next prime is 561991229. The reversal of 561991219 is 912199165.

It is a cyclic number.

It is not a de Polignac number, because 561991219 - 2¹ = 561991217 is a prime.

It is a super-2 number, since 2×561991219² = 631668260466211922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (561991211) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 274602 + ... + 276640.

It is an arithmetic number, because the mean of its divisors is an integer number (38482560).

Almost surely, 2^561991219 is an apocalyptic number.

561991219 is a deficient number, since it is larger than the sum of its proper divisors (53729741).

561991219 is a wasteful number, since it uses less digits than its factorization.

561991219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2610.

The product of its digits is 43740, while the sum is 43.

The square root of 561991219 is about 23706.3539794714. The cubic root of 561991219 is about 825.2328545038.

The spelling of 561991219 in words is "five hundred sixty-one million, nine hundred ninety-one thousand, two hundred nineteen".