6671881 has 2 divisors, whose sum is σ = 6671882. Its totient is φ = 6671880.

The previous prime is 6671879. The next prime is 6671891. The reversal of 6671881 is 1881766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3644281 + 3027600 = 1909^2 + 1740^2 .

It is a cyclic number.

It is not a de Polignac number, because 6671881 - 2¹ = 6671879 is a prime.

It is a super-2 number, since 2×6671881² = 89027992156322, which contains 22 as substring.

Together with 6671879, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6671881.

It is not a weakly prime, because it can be changed into another prime (6671801) 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, 3335940 + 3335941.

It is an arithmetic number, because the mean of its divisors is an integer number (3335941).

Almost surely, 2^6671881 is an apocalyptic number.

It is an amenable number.

6671881 is a deficient number, since it is larger than the sum of its proper divisors (1).

6671881 is an equidigital number, since it uses as much as digits as its factorization.

6671881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 37.

The square root of 6671881 is about 2582.9984514126. The cubic root of 6671881 is about 188.2562617441.

The spelling of 6671881 in words is "six million, six hundred seventy-one thousand, eight hundred eighty-one".