6679891 has 4 divisors (see below), whose sum is σ = 6695752. Its totient is φ = 6664032.

The previous prime is 6679853. The next prime is 6679901. The reversal of 6679891 is 1989766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6679891 - 2⁷ = 6679763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6679801) 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, 7281 + ... + 8146.

It is an arithmetic number, because the mean of its divisors is an integer number (1673938).

Almost surely, 2^6679891 is an apocalyptic number.

6679891 is a deficient number, since it is larger than the sum of its proper divisors (15861).

6679891 is a wasteful number, since it uses less digits than its factorization.

6679891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15860.

The product of its digits is 163296, while the sum is 46.

The square root of 6679891 is about 2584.5485098949. The cubic root of 6679891 is about 188.3315693224.

The spelling of 6679891 in words is "six million, six hundred seventy-nine thousand, eight hundred ninety-one".