573721 has 4 divisors (see below), whose sum is σ = 582352. Its totient is φ = 565092.

The previous prime is 573719. The next prime is 573737. The reversal of 573721 is 127375.

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 573721 - 2¹ = 573719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (573761) 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, 4215 + ... + 4348.

It is an arithmetic number, because the mean of its divisors is an integer number (145588).

2⁵⁷³⁷²¹ is an apocalyptic number.

It is an amenable number.

573721 is a deficient number, since it is larger than the sum of its proper divisors (8631).

573721 is an equidigital number, since it uses as much as digits as its factorization.

573721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8630.

The product of its digits is 1470, while the sum is 25.

The square root of 573721 is about 757.4437272828. The cubic root of 573721 is about 83.0934738269.

The spelling of 573721 in words is "five hundred seventy-three thousand, seven hundred twenty-one".