561361 has 4 divisors (see below), whose sum is σ = 585792. Its totient is φ = 536932.

The previous prime is 561359. The next prime is 561367. The reversal of 561361 is 163165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 163165 = 5 ⋅32633.

It is a cyclic number.

It is not a de Polignac number, because 561361 - 2¹ = 561359 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12181 + ... + 12226.

It is an arithmetic number, because the mean of its divisors is an integer number (146448).

2⁵⁶¹³⁶¹ is an apocalyptic number.

It is an amenable number.

561361 is a deficient number, since it is larger than the sum of its proper divisors (24431).

561361 is a wasteful number, since it uses less digits than its factorization.

561361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24430.

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

The square root of 561361 is about 749.2402818856. The cubic root of 561361 is about 82.4924266081.

The spelling of 561361 in words is "five hundred sixty-one thousand, three hundred sixty-one".