669009289 has 4 divisors (see below), whose sum is σ = 720471556. Its totient is φ = 617547024.

The previous prime is 669009281. The next prime is 669009307. The reversal of 669009289 is 982900966.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27248400 + 641760889 = 5220^2 + 25333^2 .

It is a cyclic number.

It is not a de Polignac number, because 669009289 - 2³ = 669009281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669009281) 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 in 3 ways as a sum of consecutive naturals, for example, 25731114 + ... + 25731139.

It is an arithmetic number, because the mean of its divisors is an integer number (180117889).

Almost surely, 2^669009289 is an apocalyptic number.

It is an amenable number.

669009289 is a deficient number, since it is larger than the sum of its proper divisors (51462267).

669009289 is a wasteful number, since it uses less digits than its factorization.

669009289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51462266.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 669009289 is about 25865.2138788760. The cubic root of 669009289 is about 874.6025030978.

The spelling of 669009289 in words is "six hundred sixty-nine million, nine thousand, two hundred eighty-nine".