6643229 has 2 divisors, whose sum is σ = 6643230. Its totient is φ = 6643228.

The previous prime is 6643213. The next prime is 6643249. The reversal of 6643229 is 9223466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6240004 + 403225 = 2498^2 + 635^2 .

It is a cyclic number.

It is not a de Polignac number, because 6643229 - 2⁴ = 6643213 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6643195 and 6643204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6643249) 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 as a sum of consecutive naturals, namely, 3321614 + 3321615.

It is an arithmetic number, because the mean of its divisors is an integer number (3321615).

Almost surely, 2^6643229 is an apocalyptic number.

It is an amenable number.

6643229 is a deficient number, since it is larger than the sum of its proper divisors (1).

6643229 is an equidigital number, since it uses as much as digits as its factorization.

6643229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 32.

The square root of 6643229 is about 2577.4462167037. The cubic root of 6643229 is about 187.9863899156.

The spelling of 6643229 in words is "six million, six hundred forty-three thousand, two hundred twenty-nine".