1669589 has 2 divisors, whose sum is σ = 1669590. Its totient is φ = 1669588.

The previous prime is 1669579. The next prime is 1669597. The reversal of 1669589 is 9859661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1582564 + 87025 = 1258^2 + 295^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669589 - 2¹² = 1665493 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1669579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834794 + 834795.

It is an arithmetic number, because the mean of its divisors is an integer number (834795).

2^1669589 is an apocalyptic number.

It is an amenable number.

1669589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669589 is an equidigital number, since it uses as much as digits as its factorization.

1669589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 44.

The square root of 1669589 is about 1292.1257678725. The cubic root of 1669589 is about 118.6323658735.

The spelling of 1669589 in words is "one million, six hundred sixty-nine thousand, five hundred eighty-nine".