573642821 has 4 divisors (see below), whose sum is σ = 574483392. Its totient is φ = 572802252.

The previous prime is 573642799. The next prime is 573642863. The reversal of 573642821 is 128246375.

It is a happy number.

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 573642821 - 2¹⁴ = 573626437 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 (573642221) 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, 419261 + ... + 420626.

It is an arithmetic number, because the mean of its divisors is an integer number (143620848).

Almost surely, 2^573642821 is an apocalyptic number.

It is an amenable number.

573642821 is a deficient number, since it is larger than the sum of its proper divisors (840571).

573642821 is an equidigital number, since it uses as much as digits as its factorization.

573642821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840570.

The product of its digits is 80640, while the sum is 38.

The square root of 573642821 is about 23950.8417597378. The cubic root of 573642821 is about 830.8969936760.

The spelling of 573642821 in words is "five hundred seventy-three million, six hundred forty-two thousand, eight hundred twenty-one".