6809861 has 4 divisors (see below), whose sum is σ = 6828492. Its totient is φ = 6791232.

The previous prime is 6809851. The next prime is 6809893. The reversal of 6809861 is 1689086.

6809861 is nontrivially palindromic in base 11.

6809861 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.

It can be written as a sum of positive squares in 2 ways, for example, as 2869636 + 3940225 = 1694^2 + 1985^2 .

It is a cyclic number.

It is not a de Polignac number, because 6809861 - 2⁶ = 6809797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6809851) 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, 8756 + ... + 9501.

It is an arithmetic number, because the mean of its divisors is an integer number (1707123).

Almost surely, 2^6809861 is an apocalyptic number.

It is an amenable number.

6809861 is a deficient number, since it is larger than the sum of its proper divisors (18631).

6809861 is a wasteful number, since it uses less digits than its factorization.

6809861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18630.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 6809861 is about 2609.5710375462. The cubic root of 6809861 is about 189.5451817552.

The spelling of 6809861 in words is "six million, eight hundred nine thousand, eight hundred sixty-one".