6817891 has 2 divisors, whose sum is σ = 6817892. Its totient is φ = 6817890.

The previous prime is 6817873. The next prime is 6817897. The reversal of 6817891 is 1987186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6817891 - 2⁵ = 6817859 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (6817897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3408945 + 3408946.

It is an arithmetic number, because the mean of its divisors is an integer number (3408946).

Almost surely, 2^6817891 is an apocalyptic number.

6817891 is a deficient number, since it is larger than the sum of its proper divisors (1).

6817891 is an equidigital number, since it uses as much as digits as its factorization.

6817891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 40.

The square root of 6817891 is about 2611.1091512995. The cubic root of 6817891 is about 189.6196546384.

The spelling of 6817891 in words is "six million, eight hundred seventeen thousand, eight hundred ninety-one".