6523221 has 4 divisors (see below), whose sum is σ = 8697632. Its totient is φ = 4348812.

The previous prime is 6523201. The next prime is 6523243. The reversal of 6523221 is 1223256.

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 not a de Polignac number, because 6523221 - 2¹⁸ = 6261077 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6523201) 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, 1087201 + ... + 1087206.

It is an arithmetic number, because the mean of its divisors is an integer number (2174408).

Almost surely, 2^6523221 is an apocalyptic number.

It is an amenable number.

6523221 is a deficient number, since it is larger than the sum of its proper divisors (2174411).

6523221 is a wasteful number, since it uses less digits than its factorization.

6523221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2174410.

The product of its digits is 720, while the sum is 21.

The square root of 6523221 is about 2554.0597095604. The cubic root of 6523221 is about 186.8475312623.

Adding to 6523221 its reverse (1223256), we get a palindrome (7746477).

The spelling of 6523221 in words is "six million, five hundred twenty-three thousand, two hundred twenty-one".