6719221 has 2 divisors, whose sum is σ = 6719222. Its totient is φ = 6719220.

The previous prime is 6719183. The next prime is 6719231. The reversal of 6719221 is 1229176.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5574321 + 1144900 = 2361^2 + 1070^2 .

It is a cyclic number.

It is not a de Polignac number, because 6719221 - 2¹⁵ = 6686453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6719221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6719231) 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, 3359610 + 3359611.

It is an arithmetic number, because the mean of its divisors is an integer number (3359611).

Almost surely, 2^6719221 is an apocalyptic number.

It is an amenable number.

6719221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6719221 is an equidigital number, since it uses as much as digits as its factorization.

6719221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 28.

The square root of 6719221 is about 2592.1460221214. The cubic root of 6719221 is about 188.7004670983.

The spelling of 6719221 in words is "six million, seven hundred nineteen thousand, two hundred twenty-one".