573821 has 4 divisors (see below), whose sum is σ = 576444. Its totient is φ = 571200.

The previous prime is 573817. The next prime is 573829. The reversal of 573821 is 128375.

573821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 151321 + 422500 = 389^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 573821 - 2² = 573817 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 (573829) 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, 950 + ... + 1431.

It is an arithmetic number, because the mean of its divisors is an integer number (144111).

2⁵⁷³⁸²¹ is an apocalyptic number.

It is an amenable number.

573821 is a deficient number, since it is larger than the sum of its proper divisors (2623).

573821 is a wasteful number, since it uses less digits than its factorization.

573821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2622.

The product of its digits is 1680, while the sum is 26.

The square root of 573821 is about 757.5097359110. The cubic root of 573821 is about 83.0983012981.

The spelling of 573821 in words is "five hundred seventy-three thousand, eight hundred twenty-one".