563581 has 4 divisors (see below), whose sum is σ = 566464. Its totient is φ = 560700.

The previous prime is 563561. The next prime is 563587. The reversal of 563581 is 185365.

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.

It is a cyclic number.

It is not a de Polignac number, because 563581 - 2¹⁹ = 39293 is a prime.

It is a super-2 number, since 2×563581² = 635247087122, which contains 22 as substring.

It is a Duffinian number.

563581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (563587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1125 + ... + 1546.

It is an arithmetic number, because the mean of its divisors is an integer number (141616).

2⁵⁶³⁵⁸¹ is an apocalyptic number.

It is an amenable number.

563581 is a deficient number, since it is larger than the sum of its proper divisors (2883).

563581 is a wasteful number, since it uses less digits than its factorization.

563581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2882.

The product of its digits is 3600, while the sum is 28.

The square root of 563581 is about 750.7203207587. The cubic root of 563581 is about 82.6010271375.

The spelling of 563581 in words is "five hundred sixty-three thousand, five hundred eighty-one".