6572221 has 4 divisors (see below), whose sum is σ = 6588700. Its totient is φ = 6555744.

The previous prime is 6572197. The next prime is 6572243. The reversal of 6572221 is 1222756.

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 4044121 + 2528100 = 2011^2 + 1590^2 .

It is a cyclic number.

It is not a de Polignac number, because 6572221 - 2¹⁹ = 6047933 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 (6572281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7626 + ... + 8443.

It is an arithmetic number, because the mean of its divisors is an integer number (1647175).

Almost surely, 2^6572221 is an apocalyptic number.

It is an amenable number.

6572221 is a deficient number, since it is larger than the sum of its proper divisors (16479).

6572221 is a wasteful number, since it uses less digits than its factorization.

6572221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16478.

The product of its digits is 1680, while the sum is 25.

The square root of 6572221 is about 2563.6343342996. The cubic root of 6572221 is about 187.3142076643.

Adding to 6572221 its reverse (1222756), we get a palindrome (7794977).

The spelling of 6572221 in words is "six million, five hundred seventy-two thousand, two hundred twenty-one".