6891169 has 2 divisors, whose sum is σ = 6891170. Its totient is φ = 6891168.

The previous prime is 6891161. The next prime is 6891173. The reversal of 6891169 is 9611986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6451600 + 439569 = 2540^2 + 663^2 .

It is a cyclic number.

It is not a de Polignac number, because 6891169 - 2³ = 6891161 is a prime.

It is a super-2 number, since 2×6891169² = 94976420373122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6891161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3445584 + 3445585.

It is an arithmetic number, because the mean of its divisors is an integer number (3445585).

Almost surely, 2^6891169 is an apocalyptic number.

It is an amenable number.

6891169 is a deficient number, since it is larger than the sum of its proper divisors (1).

6891169 is an equidigital number, since it uses as much as digits as its factorization.

6891169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 40.

The square root of 6891169 is about 2625.1036170026. The cubic root of 6891169 is about 190.2965728468.

The spelling of 6891169 in words is "six million, eight hundred ninety-one thousand, one hundred sixty-nine".