990559 has 2 divisors, whose sum is σ = 990560. Its totient is φ = 990558.

The previous prime is 990547. The next prime is 990589. The reversal of 990559 is 955099.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 990559 - 2¹¹ = 988511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495279 + 495280.

It is an arithmetic number, because the mean of its divisors is an integer number (495280).

2⁹⁹⁰⁵⁵⁹ is an apocalyptic number.

990559 is a deficient number, since it is larger than the sum of its proper divisors (1).

990559 is an equidigital number, since it uses as much as digits as its factorization.

990559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18225, while the sum is 37.

The square root of 990559 is about 995.2683055337. The cubic root of 990559 is about 99.6843044117.

The spelling of 990559 in words is "nine hundred ninety thousand, five hundred fifty-nine".