1806808081 has 8 divisors (see below), whose sum is σ = 1947171240. Its totient is φ = 1666641792.

The previous prime is 1806808067. The next prime is 1806808103. The reversal of 1806808081 is 1808086081.

It can be written as a sum of positive squares in 4 ways, for example, as 200081025 + 1606727056 = 14145^2 + 40084^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1806808081 - 2⁷ = 1806807953 is a prime.

It is a super-2 number, since 2×1806808081² = 6529110883133805122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1806808051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29866 + ... + 67123.

It is an arithmetic number, because the mean of its divisors is an integer number (243396405).

Almost surely, 2^1806808081 is an apocalyptic number.

It is an amenable number.

1806808081 is a deficient number, since it is larger than the sum of its proper divisors (140363159).

1806808081 is a wasteful number, since it uses less digits than its factorization.

1806808081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98435.

The product of its (nonzero) digits is 24576, while the sum is 40.

The square root of 1806808081 is about 42506.5651517504. The cubic root of 1806808081 is about 1217.9721038456.

The spelling of 1806808081 in words is "one billion, eight hundred six million, eight hundred eight thousand, eighty-one".