999990289 has 2 divisors, whose sum is σ = 999990290. Its totient is φ = 999990288.

The previous prime is 999990259. The next prime is 999990293. The reversal of 999990289 is 982099999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 965966400 + 34023889 = 31080^2 + 5833^2 .

It is a cyclic number.

It is not a de Polignac number, because 999990289 - 2⁹ = 999989777 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999990289.

It is not a weakly prime, because it can be changed into another prime (999990239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499995144 + 499995145.

It is an arithmetic number, because the mean of its divisors is an integer number (499995145).

Almost surely, 2^999990289 is an apocalyptic number.

It is an amenable number.

999990289 is a deficient number, since it is larger than the sum of its proper divisors (1).

999990289 is an equidigital number, since it uses as much as digits as its factorization.

999990289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8503056, while the sum is 64.

The square root of 999990289 is about 31622.6230569192. The cubic root of 999990289 is about 999.9967629895.

The spelling of 999990289 in words is "nine hundred ninety-nine million, nine hundred ninety thousand, two hundred eighty-nine".