561613 has 4 divisors (see below), whose sum is σ = 604828. Its totient is φ = 518400.

The previous prime is 561607. The next prime is 561667. The reversal of 561613 is 316165.

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 227529 + 334084 = 477^2 + 578^2 .

It is a cyclic number.

It is not a de Polignac number, because 561613 - 2⁹ = 561101 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 (561313) 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, 21588 + ... + 21613.

It is an arithmetic number, because the mean of its divisors is an integer number (151207).

2⁵⁶¹⁶¹³ is an apocalyptic number.

It is an amenable number.

561613 is a deficient number, since it is larger than the sum of its proper divisors (43215).

561613 is a wasteful number, since it uses less digits than its factorization.

561613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43214.

The product of its digits is 540, while the sum is 22.

The square root of 561613 is about 749.4084333659. The cubic root of 561613 is about 82.5047686255.

Adding to 561613 its reverse (316165), we get a palindrome (877778).

The spelling of 561613 in words is "five hundred sixty-one thousand, six hundred thirteen".