6921197 has 2 divisors, whose sum is σ = 6921198. Its totient is φ = 6921196.

The previous prime is 6921181. The next prime is 6921209. The reversal of 6921197 is 7911296.

6921197 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4405801 + 2515396 = 2099^2 + 1586^2 .

It is a cyclic number.

It is not a de Polignac number, because 6921197 - 2⁴ = 6921181 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6921107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3460598 + 3460599.

It is an arithmetic number, because the mean of its divisors is an integer number (3460599).

Almost surely, 2^6921197 is an apocalyptic number.

It is an amenable number.

6921197 is a deficient number, since it is larger than the sum of its proper divisors (1).

6921197 is an equidigital number, since it uses as much as digits as its factorization.

6921197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 35.

The square root of 6921197 is about 2630.8167933172. The cubic root of 6921197 is about 190.5725756404.

Subtracting 6921197 from its reverse (7911296), we obtain a palindrome (990099).

The spelling of 6921197 in words is "six million, nine hundred twenty-one thousand, one hundred ninety-seven".