6681971 has 2 divisors, whose sum is σ = 6681972. Its totient is φ = 6681970.

The previous prime is 6681967. The next prime is 6681979. The reversal of 6681971 is 1791866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6681971 - 2² = 6681967 is a prime.

It is a super-3 number, since 3×6681971³ (a number of 21 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6681979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3340985 + 3340986.

It is an arithmetic number, because the mean of its divisors is an integer number (3340986).

Almost surely, 2^6681971 is an apocalyptic number.

6681971 is a deficient number, since it is larger than the sum of its proper divisors (1).

6681971 is an equidigital number, since it uses as much as digits as its factorization.

6681971 is an odious number, because the sum of its binary digits is odd.

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

The square root of 6681971 is about 2584.9508699393. The cubic root of 6681971 is about 188.3511150012.

The spelling of 6681971 in words is "six million, six hundred eighty-one thousand, nine hundred seventy-one".