6530221 has 2 divisors, whose sum is σ = 6530222. Its totient is φ = 6530220.

The previous prime is 6530203. The next prime is 6530257. The reversal of 6530221 is 1220356.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5692996 + 837225 = 2386^2 + 915^2 .

It is a cyclic number.

It is not a de Polignac number, because 6530221 - 2⁵ = 6530189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6530621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3265110 + 3265111.

It is an arithmetic number, because the mean of its divisors is an integer number (3265111).

Almost surely, 2^6530221 is an apocalyptic number.

It is an amenable number.

6530221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6530221 is an equidigital number, since it uses as much as digits as its factorization.

6530221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 6530221 is about 2555.4297094618. The cubic root of 6530221 is about 186.9143420784.

Adding to 6530221 its reverse (1220356), we get a palindrome (7750577).

The spelling of 6530221 in words is "six million, five hundred thirty thousand, two hundred twenty-one".