1289009 has 2 divisors, whose sum is σ = 1289010. Its totient is φ = 1289008.

The previous prime is 1289003. The next prime is 1289027. The reversal of 1289009 is 9009821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1288225 + 784 = 1135^2 + 28^2 .

It is a cyclic number.

It is not a de Polignac number, because 1289009 - 2⁴ = 1288993 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1289003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644504 + 644505.

It is an arithmetic number, because the mean of its divisors is an integer number (644505).

2^1289009 is an apocalyptic number.

It is an amenable number.

1289009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1289009 is an equidigital number, since it uses as much as digits as its factorization.

1289009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1289009 is about 1135.3453219175. The cubic root of 1289009 is about 108.8308404948.

The spelling of 1289009 in words is "one million, two hundred eighty-nine thousand, nine".