6891161 has 2 divisors, whose sum is σ = 6891162. Its totient is φ = 6891160.

The previous prime is 6891149. The next prime is 6891169. The reversal of 6891161 is 1611986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6553600 + 337561 = 2560^2 + 581^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6891161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6891169) 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, 3445580 + 3445581.

It is an arithmetic number, because the mean of its divisors is an integer number (3445581).

Almost surely, 2^6891161 is an apocalyptic number.

It is an amenable number.

6891161 is a deficient number, since it is larger than the sum of its proper divisors (1).

6891161 is an equidigital number, since it uses as much as digits as its factorization.

6891161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 32.

The square root of 6891161 is about 2625.1020932528. The cubic root of 6891161 is about 190.2964992079.

The spelling of 6891161 in words is "six million, eight hundred ninety-one thousand, one hundred sixty-one".