990289 has 2 divisors, whose sum is σ = 990290. Its totient is φ = 990288.

The previous prime is 990287. The next prime is 990293. The reversal of 990289 is 982099.

990289 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., 748225 + 242064 = 865^2 + 492^2 .

It is an emirp because it is prime and its reverse (982099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 990289 - 2¹ = 990287 is a prime.

Together with 990287, it forms a pair of twin primes.

It is a Chen prime.

990289 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (990281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495144 + 495145.

It is an arithmetic number, because the mean of its divisors is an integer number (495145).

2⁹⁹⁰²⁸⁹ is an apocalyptic number.

It is an amenable number.

990289 is a deficient number, since it is larger than the sum of its proper divisors (1).

990289 is an equidigital number, since it uses as much as digits as its factorization.

990289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 990289 is about 995.1326544738. The cubic root of 990289 is about 99.6752464933.

The spelling of 990289 in words is "nine hundred ninety thousand, two hundred eighty-nine".