561217 has 4 divisors (see below), whose sum is σ = 571860. Its totient is φ = 550576.

The previous prime is 561199. The next prime is 561229. The reversal of 561217 is 712165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 712165 = 5 ⋅142433.

It can be written as a sum of positive squares in 2 ways, for example, as 229441 + 331776 = 479^2 + 576^2 .

It is a cyclic number.

It is not a de Polignac number, because 561217 - 2¹⁹ = 36929 is a prime.

It is a Duffinian number.

561217 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (561277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5242 + ... + 5347.

It is an arithmetic number, because the mean of its divisors is an integer number (142965).

2⁵⁶¹²¹⁷ is an apocalyptic number.

It is an amenable number.

561217 is a deficient number, since it is larger than the sum of its proper divisors (10643).

561217 is a wasteful number, since it uses less digits than its factorization.

561217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10642.

The product of its digits is 420, while the sum is 22.

The square root of 561217 is about 749.1441783796. The cubic root of 561217 is about 82.4853723683.

The spelling of 561217 in words is "five hundred sixty-one thousand, two hundred seventeen".