6647213 has 2 divisors, whose sum is σ = 6647214. Its totient is φ = 6647212.

The previous prime is 6647209. The next prime is 6647219. The reversal of 6647213 is 3127466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5750404 + 896809 = 2398^2 + 947^2 .

It is a cyclic number.

It is not a de Polignac number, because 6647213 - 2² = 6647209 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6647219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323606 + 3323607.

It is an arithmetic number, because the mean of its divisors is an integer number (3323607).

Almost surely, 2^6647213 is an apocalyptic number.

It is an amenable number.

6647213 is a deficient number, since it is larger than the sum of its proper divisors (1).

6647213 is an equidigital number, since it uses as much as digits as its factorization.

6647213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 29.

The square root of 6647213 is about 2578.2189588939. The cubic root of 6647213 is about 188.0239614094.

The spelling of 6647213 in words is "six million, six hundred forty-seven thousand, two hundred thirteen".