6806813581 has 2 divisors, whose sum is σ = 6806813582. Its totient is φ = 6806813580.

The previous prime is 6806813569. The next prime is 6806813599. The reversal of 6806813581 is 1853186086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6250325481 + 556488100 = 79059^2 + 23590^2 .

It is a cyclic number.

It is not a de Polignac number, because 6806813581 - 2³¹ = 4659329933 is a prime.

It is a super-2 number, since 2×6806813581² = 92665422252972087122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6806813551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3403406790 + 3403406791.

It is an arithmetic number, because the mean of its divisors is an integer number (3403406791).

Almost surely, 2^6806813581 is an apocalyptic number.

It is an amenable number.

6806813581 is a deficient number, since it is larger than the sum of its proper divisors (1).

6806813581 is an equidigital number, since it uses as much as digits as its factorization.

6806813581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 276480, while the sum is 46.

The square root of 6806813581 is about 82503.4155717204. The cubic root of 6806813581 is about 1895.1690365616.

The spelling of 6806813581 in words is "six billion, eight hundred six million, eight hundred thirteen thousand, five hundred eighty-one".