6966221 has 2 divisors, whose sum is σ = 6966222. Its totient is φ = 6966220.

The previous prime is 6966203. The next prime is 6966233. The reversal of 6966221 is 1226696.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6832996 + 133225 = 2614^2 + 365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6966221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6966241) 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, 3483110 + 3483111.

It is an arithmetic number, because the mean of its divisors is an integer number (3483111).

Almost surely, 2^6966221 is an apocalyptic number.

It is an amenable number.

6966221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6966221 is an equidigital number, since it uses as much as digits as its factorization.

6966221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 32.

The square root of 6966221 is about 2639.3599602934. The cubic root of 6966221 is about 190.9849224687.

The spelling of 6966221 in words is "six million, nine hundred sixty-six thousand, two hundred twenty-one".