6806581 has 4 divisors (see below), whose sum is σ = 6888672. Its totient is φ = 6724492.

The previous prime is 6806573. The next prime is 6806603. The reversal of 6806581 is 1856086.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1856086 = 2 ⋅928043.

It is a cyclic number.

It is not a de Polignac number, because 6806581 - 2³ = 6806573 is a prime.

It is a super-2 number, since 2×6806581² = 92659089819122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6806521) 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, 40921 + ... + 41086.

It is an arithmetic number, because the mean of its divisors is an integer number (1722168).

Almost surely, 2^6806581 is an apocalyptic number.

It is an amenable number.

6806581 is a deficient number, since it is larger than the sum of its proper divisors (82091).

6806581 is an equidigital number, since it uses as much as digits as its factorization.

6806581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82090.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 6806581 is about 2608.9425060741. The cubic root of 6806581 is about 189.5147451066.

The spelling of 6806581 in words is "six million, eight hundred six thousand, five hundred eighty-one".