563621 has 4 divisors (see below), whose sum is σ = 578892. Its totient is φ = 548352.

The previous prime is 563599. The next prime is 563623. The reversal of 563621 is 126365.

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 302500 + 261121 = 550^2 + 511^2 .

It is a cyclic number.

It is not a de Polignac number, because 563621 - 2¹⁴ = 547237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 563621.

It is not an unprimeable number, because it can be changed into a prime (563623) 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, 7580 + ... + 7653.

It is an arithmetic number, because the mean of its divisors is an integer number (144723).

2⁵⁶³⁶²¹ is an apocalyptic number.

It is an amenable number.

563621 is a deficient number, since it is larger than the sum of its proper divisors (15271).

563621 is a wasteful number, since it uses less digits than its factorization.

563621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15270.

The product of its digits is 1080, while the sum is 23.

The square root of 563621 is about 750.7469613658. The cubic root of 563621 is about 82.6029812860.

Adding to 563621 its reverse (126365), we get a palindrome (689986).

The spelling of 563621 in words is "five hundred sixty-three thousand, six hundred twenty-one".