669289 has 2 divisors, whose sum is σ = 669290. Its totient is φ = 669288.

The previous prime is 669287. The next prime is 669301. The reversal of 669289 is 982966.

It is a happy number.

669289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 627264 + 42025 = 792^2 + 205^2 .

It is a cyclic number.

It is not a de Polignac number, because 669289 - 2¹ = 669287 is a prime.

Together with 669287, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (669283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334644 + 334645.

It is an arithmetic number, because the mean of its divisors is an integer number (334645).

2⁶⁶⁹²⁸⁹ is an apocalyptic number.

It is an amenable number.

669289 is a deficient number, since it is larger than the sum of its proper divisors (1).

669289 is an equidigital number, since it uses as much as digits as its factorization.

669289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 669289 is about 818.1008495290. The cubic root of 669289 is about 87.4724375773.

The spelling of 669289 in words is "six hundred sixty-nine thousand, two hundred eighty-nine".