6494990809 has 2 divisors, whose sum is σ = 6494990810. Its totient is φ = 6494990808.

The previous prime is 6494990797. The next prime is 6494990813. The reversal of 6494990809 is 9080994946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6361657600 + 133333209 = 79760^2 + 11547^2 .

It is a cyclic number.

It is not a de Polignac number, because 6494990809 - 2⁹ = 6494990297 is a prime.

It is not a weakly prime, because it can be changed into another prime (6494990839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3247495404 + 3247495405.

It is an arithmetic number, because the mean of its divisors is an integer number (3247495405).

Almost surely, 2^6494990809 is an apocalyptic number.

It is an amenable number.

6494990809 is a deficient number, since it is larger than the sum of its proper divisors (1).

6494990809 is an equidigital number, since it uses as much as digits as its factorization.

6494990809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5038848, while the sum is 58.

The square root of 6494990809 is about 80591.5058117169. The cubic root of 6494990809 is about 1865.7760485053.

The spelling of 6494990809 in words is "six billion, four hundred ninety-four million, nine hundred ninety thousand, eight hundred nine".