6891943 has 2 divisors, whose sum is σ = 6891944. Its totient is φ = 6891942.

The previous prime is 6891931. The next prime is 6891949. The reversal of 6891943 is 3491986.

6891943 is nontrivially palindromic in base 3.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6891943 - 2²¹ = 4794791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6891896 and 6891905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6891949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3445971 + 3445972.

It is an arithmetic number, because the mean of its divisors is an integer number (3445972).

Almost surely, 2^6891943 is an apocalyptic number.

6891943 is a deficient number, since it is larger than the sum of its proper divisors (1).

6891943 is an equidigital number, since it uses as much as digits as its factorization.

6891943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 6891943 is about 2625.2510356155. The cubic root of 6891943 is about 190.3036971355.

The spelling of 6891943 in words is "six million, eight hundred ninety-one thousand, nine hundred forty-three".