6716221 has 2 divisors, whose sum is σ = 6716222. Its totient is φ = 6716220.

The previous prime is 6716209. The next prime is 6716257. The reversal of 6716221 is 1226176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4120900 + 2595321 = 2030^2 + 1611^2 .

It is a cyclic number.

It is not a de Polignac number, because 6716221 - 2⁷ = 6716093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6716201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3358110 + 3358111.

It is an arithmetic number, because the mean of its divisors is an integer number (3358111).

Almost surely, 2^6716221 is an apocalyptic number.

It is an amenable number.

6716221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6716221 is an equidigital number, since it uses as much as digits as its factorization.

6716221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 25.

The square root of 6716221 is about 2591.5672864118. The cubic root of 6716221 is about 188.6723792355.

The spelling of 6716221 in words is "six million, seven hundred sixteen thousand, two hundred twenty-one".