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6881 = 7983

6881 has 4 divisors (see below), whose sum is σ = 7872. Its totient is φ = 5892.

The previous prime is 6871. The next prime is 6883. The reversal of 6881 is 1886.

6881 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6881 - 210 = 5857 is a prime.

It is a super-2 number, since 2×68812 = 94696322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 6881.

It is not an unprimeable number, because it can be changed into a prime (6883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485 + ... + 498.

It is an arithmetic number, because the mean of its divisors is an integer number (1968).

It is an amenable number.

6881 is a deficient number, since it is larger than the sum of its proper divisors (991).

6881 is an equidigital number, since it uses as much as digits as its factorization.

6881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990.

The product of its digits is 384, while the sum is 23.

The square root of 6881 is about 82.9517932296. The cubic root of 6881 is about 19.0202922626.

The spelling of 6881 in words is "six thousand, eight hundred eighty-one".

Divisors: 1 7 983 6881