6886691 has 4 divisors (see below), whose sum is σ = 7870512. Its totient is φ = 5902872.

The previous prime is 6886679. The next prime is 6886727. The reversal of 6886691 is 1966886.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1966886 = 2 ⋅983443.

It is a cyclic number.

It is not a de Polignac number, because 6886691 - 2¹⁰ = 6885667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6886091) 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, 491900 + ... + 491913.

It is an arithmetic number, because the mean of its divisors is an integer number (1967628).

Almost surely, 2^6886691 is an apocalyptic number.

6886691 is a deficient number, since it is larger than the sum of its proper divisors (983821).

6886691 is an equidigital number, since it uses as much as digits as its factorization.

6886691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983820.

The product of its digits is 124416, while the sum is 44.

The square root of 6886691 is about 2624.2505596837. The cubic root of 6886691 is about 190.2553445878.

Adding to 6886691 its product of digits (124416), we get a palindrome (7011107).

The spelling of 6886691 in words is "six million, eight hundred eighty-six thousand, six hundred ninety-one".