6449000081 has 2 divisors, whose sum is σ = 6449000082. Its totient is φ = 6449000080.

The previous prime is 6449000071. The next prime is 6449000087. The reversal of 6449000081 is 1800009446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6102109456 + 346890625 = 78116^2 + 18625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6449000081 is a prime.

It is a super-2 number, since 2×6449000081² = 83179204089476013122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6449000087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3224500040 + 3224500041.

It is an arithmetic number, because the mean of its divisors is an integer number (3224500041).

Almost surely, 2^6449000081 is an apocalyptic number.

It is an amenable number.

6449000081 is a deficient number, since it is larger than the sum of its proper divisors (1).

6449000081 is an equidigital number, since it uses as much as digits as its factorization.

6449000081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 6449000081 is about 80305.6665559785. Note that the first 3 decimals coincide. The cubic root of 6449000081 is about 1861.3617885058.

The spelling of 6449000081 in words is "six billion, four hundred forty-nine million, eighty-one", and thus it is an aban number.