6851687 has 2 divisors, whose sum is σ = 6851688. Its totient is φ = 6851686.

The previous prime is 6851683. The next prime is 6851717. The reversal of 6851687 is 7861586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6851687 - 2² = 6851683 is a prime.

It is a super-2 number, since 2×6851687² = 93891229491938, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6851683) 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, 3425843 + 3425844.

It is an arithmetic number, because the mean of its divisors is an integer number (3425844).

Almost surely, 2^6851687 is an apocalyptic number.

6851687 is a deficient number, since it is larger than the sum of its proper divisors (1).

6851687 is an equidigital number, since it uses as much as digits as its factorization.

6851687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 41.

The square root of 6851687 is about 2617.5727306037. The cubic root of 6851687 is about 189.9324505950.

The spelling of 6851687 in words is "six million, eight hundred fifty-one thousand, six hundred eighty-seven".