6671891 has 2 divisors, whose sum is σ = 6671892. Its totient is φ = 6671890.

The previous prime is 6671881. The next prime is 6671893. The reversal of 6671891 is 1981766.

6671891 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 is a cyclic number.

It is not a de Polignac number, because 6671891 - 2¹⁸ = 6409747 is a prime.

Together with 6671893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6671893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3335945 + 3335946.

It is an arithmetic number, because the mean of its divisors is an integer number (3335946).

Almost surely, 2^6671891 is an apocalyptic number.

6671891 is a deficient number, since it is larger than the sum of its proper divisors (1).

6671891 is an equidigital number, since it uses as much as digits as its factorization.

6671891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 38.

The square root of 6671891 is about 2583.0003871467. Note that the first 3 decimals coincide. The cubic root of 6671891 is about 188.2563557986.

The spelling of 6671891 in words is "six million, six hundred seventy-one thousand, eight hundred ninety-one".