6806881 has 3 divisors (see below), whose sum is σ = 6809491. Its totient is φ = 6804272.

The previous prime is 6806837. The next prime is 6806893. The reversal of 6806881 is 1886086.

The square root of 6806881 is 2609.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1886086 = 2 ⋅943043.

It can be written as a sum of positive squares in only one way, i.e., 3272481 + 3534400 = 1809^2 + 1880^2 .

It is not a de Polignac number, because 6806881 - 2¹³ = 6798689 is a prime.

It is a super-2 number, since 2×6806881² = 92667257896322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6806881.

It is not an unprimeable number, because it can be changed into a prime (6806801) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1305 + ... + 3913.

Almost surely, 2^6806881 is an apocalyptic number.

6806881 is the 2609-th square number.

6806881 is the 1305-th centered octagonal number.

It is an amenable number.

6806881 is a deficient number, since it is larger than the sum of its proper divisors (2610).

6806881 is an frugal number, since it uses more digits than its factorization.

6806881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5218 (or 2609 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 37.

The cubic root of 6806881 is about 189.5175293526.

The spelling of 6806881 in words is "six million, eight hundred six thousand, eight hundred eighty-one".