6386221 has 2 divisors, whose sum is σ = 6386222. Its totient is φ = 6386220.

The previous prime is 6386209. The next prime is 6386227. The reversal of 6386221 is 1226836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4796100 + 1590121 = 2190^2 + 1261^2 .

It is a cyclic number.

It is not a de Polignac number, because 6386221 - 2¹¹ = 6384173 is a prime.

It is equal to p₄₃₇₅₃₆ and since 6386221 and 437536 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6386221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6386227) 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 as a sum of consecutive naturals, namely, 3193110 + 3193111.

It is an arithmetic number, because the mean of its divisors is an integer number (3193111).

Almost surely, 2^6386221 is an apocalyptic number.

It is an amenable number.

6386221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6386221 is an equidigital number, since it uses as much as digits as its factorization.

6386221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 6386221 is about 2527.0973467597. The cubic root of 6386221 is about 185.5302149981.

It can be divided in two parts, 638 and 6221, that added together give a cube (6859 = 19³).

The spelling of 6386221 in words is "six million, three hundred eighty-six thousand, two hundred twenty-one".