561722279 has 4 divisors (see below), whose sum is σ = 594764784. Its totient is φ = 528679776.

The previous prime is 561722267. The next prime is 561722309. The reversal of 561722279 is 972227165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 561722279 - 2¹⁶ = 561656743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561725279) 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 3 ways as a sum of consecutive naturals, for example, 16521227 + ... + 16521260.

It is an arithmetic number, because the mean of its divisors is an integer number (148691196).

Almost surely, 2^561722279 is an apocalyptic number.

561722279 is a deficient number, since it is larger than the sum of its proper divisors (33042505).

561722279 is a wasteful number, since it uses less digits than its factorization.

561722279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33042504.

The product of its digits is 105840, while the sum is 41.

The square root of 561722279 is about 23700.6809817777. The cubic root of 561722279 is about 825.1011955451.

The spelling of 561722279 in words is "five hundred sixty-one million, seven hundred twenty-two thousand, two hundred seventy-nine".