561719281 has 8 divisors (see below), whose sum is σ = 574369704. Its totient is φ = 549144960.

The previous prime is 561719261. The next prime is 561719297. The reversal of 561719281 is 182917165.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 368064225 + 193655056 = 19185^2 + 13916^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 561719281 - 2¹⁵ = 561686513 is a prime.

It is a super-2 number, since 2×561719281² = 631057101294313922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561719251) 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 7 ways as a sum of consecutive naturals, for example, 3966 + ... + 33751.

It is an arithmetic number, because the mean of its divisors is an integer number (71796213).

Almost surely, 2^561719281 is an apocalyptic number.

It is an amenable number.

561719281 is a deficient number, since it is larger than the sum of its proper divisors (12650423).

561719281 is a wasteful number, since it uses less digits than its factorization.

561719281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38051.

The product of its digits is 30240, while the sum is 40.

The square root of 561719281 is about 23700.6177345655. The cubic root of 561719281 is about 825.0997276443.

The spelling of 561719281 in words is "five hundred sixty-one million, seven hundred nineteen thousand, two hundred eighty-one".