563721 has 4 divisors (see below), whose sum is σ = 751632. Its totient is φ = 375812.

The previous prime is 563663. The next prime is 563723. The reversal of 563721 is 127365.

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 563721 - 2⁶ = 563657 is a prime.

It is a D-number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 563691 and 563700.

It is not an unprimeable number, because it can be changed into a prime (563723) 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, 93951 + ... + 93956.

It is an arithmetic number, because the mean of its divisors is an integer number (187908).

2⁵⁶³⁷²¹ is an apocalyptic number.

It is an amenable number.

563721 is a deficient number, since it is larger than the sum of its proper divisors (187911).

563721 is a wasteful number, since it uses less digits than its factorization.

563721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187910.

The product of its digits is 1260, while the sum is 24.

The square root of 563721 is about 750.8135587481. The cubic root of 563721 is about 82.6078662529.

The spelling of 563721 in words is "five hundred sixty-three thousand, seven hundred twenty-one".