6413221 has 4 divisors (see below), whose sum is σ = 6423372. Its totient is φ = 6403072.

The previous prime is 6413219. The next prime is 6413243. The reversal of 6413221 is 1223146.

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 6320196 + 93025 = 2514^2 + 305^2 .

It is a cyclic number.

It is not a de Polignac number, because 6413221 - 2¹ = 6413219 is a prime.

It is a super-2 number, since 2×6413221² = 82258807189682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6413201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4060 + ... + 5413.

It is an arithmetic number, because the mean of its divisors is an integer number (1605843).

Almost surely, 2^6413221 is an apocalyptic number.

6413221 is the 1354-th nonagonal number.

It is an amenable number.

6413221 is a deficient number, since it is larger than the sum of its proper divisors (10151).

6413221 is an equidigital number, since it uses as much as digits as its factorization.

6413221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10150.

The product of its digits is 288, while the sum is 19.

The square root of 6413221 is about 2532.4338095990. The cubic root of 6413221 is about 185.7913121734.

Adding to 6413221 its reverse (1223146), we get a palindrome (7636367).

The spelling of 6413221 in words is "six million, four hundred thirteen thousand, two hundred twenty-one".