6743221 has 4 divisors (see below), whose sum is σ = 6752844. Its totient is φ = 6733600.

The previous prime is 6743197. The next prime is 6743239. The reversal of 6743221 is 1223476.

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 3186225 + 3556996 = 1785^2 + 1886^2 .

It is a cyclic number.

It is not a de Polignac number, because 6743221 - 2⁵ = 6743189 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 (6743281) 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, 3670 + ... + 5191.

It is an arithmetic number, because the mean of its divisors is an integer number (1688211).

Almost surely, 2^6743221 is an apocalyptic number.

It is an amenable number.

6743221 is a deficient number, since it is larger than the sum of its proper divisors (9623).

6743221 is an equidigital number, since it uses as much as digits as its factorization.

6743221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9622.

The product of its digits is 2016, while the sum is 25.

The square root of 6743221 is about 2596.7712644744. The cubic root of 6743221 is about 188.9248695907.

Adding to 6743221 its reverse (1223476), we get a palindrome (7966697).

The spelling of 6743221 in words is "six million, seven hundred forty-three thousand, two hundred twenty-one".