6686171 has 4 divisors (see below), whose sum is σ = 6691344. Its totient is φ = 6681000.

The previous prime is 6686167. The next prime is 6686177. The reversal of 6686171 is 1716866.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1716866 = 2 ⋅858433.

It is a cyclic number.

It is not a de Polignac number, because 6686171 - 2² = 6686167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6686177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1241 + ... + 3861.

It is an arithmetic number, because the mean of its divisors is an integer number (1672836).

Almost surely, 2^6686171 is an apocalyptic number.

6686171 is a deficient number, since it is larger than the sum of its proper divisors (5173).

6686171 is a wasteful number, since it uses less digits than its factorization.

6686171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5172.

The product of its digits is 12096, while the sum is 35.

The square root of 6686171 is about 2585.7631368708. The cubic root of 6686171 is about 188.3905698764.

The spelling of 6686171 in words is "six million, six hundred eighty-six thousand, one hundred seventy-one".