6489559891 has 2 divisors, whose sum is σ = 6489559892. Its totient is φ = 6489559890.

The previous prime is 6489559861. The next prime is 6489559897. The reversal of 6489559891 is 1989559846.

6489559891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6489559891 - 2¹³ = 6489551699 is a prime.

It is a super-2 number, since 2×6489559891² = 84228775157751863762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6489559897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3244779945 + 3244779946.

It is an arithmetic number, because the mean of its divisors is an integer number (3244779946).

Almost surely, 2^6489559891 is an apocalyptic number.

6489559891 is a deficient number, since it is larger than the sum of its proper divisors (1).

6489559891 is an equidigital number, since it uses as much as digits as its factorization.

6489559891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27993600, while the sum is 64.

The square root of 6489559891 is about 80557.8046560357. The cubic root of 6489559891 is about 1865.2558680253.

The spelling of 6489559891 in words is "six billion, four hundred eighty-nine million, five hundred fifty-nine thousand, eight hundred ninety-one".