6489209 has 2 divisors, whose sum is σ = 6489210. Its totient is φ = 6489208.

The previous prime is 6489179. The next prime is 6489211. The reversal of 6489209 is 9029846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4963984 + 1525225 = 2228^2 + 1235^2 .

It is a cyclic number.

It is not a de Polignac number, because 6489209 - 2¹² = 6485113 is a prime.

It is a Sophie Germain prime.

Together with 6489211, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6489299) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3244604 + 3244605.

It is an arithmetic number, because the mean of its divisors is an integer number (3244605).

Almost surely, 2^6489209 is an apocalyptic number.

It is an amenable number.

6489209 is a deficient number, since it is larger than the sum of its proper divisors (1).

6489209 is an equidigital number, since it uses as much as digits as its factorization.

6489209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 6489209 is about 2547.3925885108. The cubic root of 6489209 is about 186.5222249244.

The spelling of 6489209 in words is "six million, four hundred eighty-nine thousand, two hundred nine".