669089 has 2 divisors, whose sum is σ = 669090. Its totient is φ = 669088.

The previous prime is 669077. The next prime is 669091. The reversal of 669089 is 980966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 667489 + 1600 = 817^2 + 40^2 .

It is a cyclic number.

It is not a de Polignac number, because 669089 - 2¹⁶ = 603553 is a prime.

Together with 669091, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (669029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334544 + 334545.

It is an arithmetic number, because the mean of its divisors is an integer number (334545).

2⁶⁶⁹⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

669089 is a deficient number, since it is larger than the sum of its proper divisors (1).

669089 is an equidigital number, since it uses as much as digits as its factorization.

669089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 669089 is about 817.9786060772. The cubic root of 669089 is about 87.4637237380.

The spelling of 669089 in words is "six hundred sixty-nine thousand, eighty-nine".