6916561 has 2 divisors, whose sum is σ = 6916562. Its totient is φ = 6916560.

The previous prime is 6916549. The next prime is 6916571. The reversal of 6916561 is 1656196.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5664400 + 1252161 = 2380^2 + 1119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6916561 is a prime.

It is not a weakly prime, because it can be changed into another prime (6916571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3458280 + 3458281.

It is an arithmetic number, because the mean of its divisors is an integer number (3458281).

Almost surely, 2^6916561 is an apocalyptic number.

It is an amenable number.

6916561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6916561 is an equidigital number, since it uses as much as digits as its factorization.

6916561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 34.

The square root of 6916561 is about 2629.9355505411. The cubic root of 6916561 is about 190.5300159600.

The spelling of 6916561 in words is "six million, nine hundred sixteen thousand, five hundred sixty-one".