561710213 has 4 divisors (see below), whose sum is σ = 562503180. Its totient is φ = 560917248.

The previous prime is 561710203. The next prime is 561710221. The reversal of 561710213 is 312017165.

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

It can be written as a sum of positive squares in 2 ways, for example, as 357134404 + 204575809 = 18898^2 + 14303^2 .

It is a cyclic number.

It is not a de Polignac number, because 561710213 - 2⁸ = 561709957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561710203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 395420 + ... + 396837.

It is an arithmetic number, because the mean of its divisors is an integer number (140625795).

Almost surely, 2^561710213 is an apocalyptic number.

It is an amenable number.

561710213 is a deficient number, since it is larger than the sum of its proper divisors (792967).

561710213 is an equidigital number, since it uses as much as digits as its factorization.

561710213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792966.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 561710213 is about 23700.4264307628. The cubic root of 561710213 is about 825.0952876776.

Adding to 561710213 its reverse (312017165), we get a palindrome (873727378).

The spelling of 561710213 in words is "five hundred sixty-one million, seven hundred ten thousand, two hundred thirteen".