990859589 has 2 divisors, whose sum is σ = 990859590. Its totient is φ = 990859588.

The previous prime is 990859577. The next prime is 990859607. The reversal of 990859589 is 985958099.

990859589 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., 923126689 + 67732900 = 30383^2 + 8230^2 .

It is a cyclic number.

It is not a de Polignac number, because 990859589 - 2¹⁶ = 990794053 is a prime.

It is a super-2 number, since 2×990859589² = 1963605450226497842, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990849589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495429794 + 495429795.

It is an arithmetic number, because the mean of its divisors is an integer number (495429795).

Almost surely, 2^990859589 is an apocalyptic number.

It is an amenable number.

990859589 is a deficient number, since it is larger than the sum of its proper divisors (1).

990859589 is an equidigital number, since it uses as much as digits as its factorization.

990859589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10497600, while the sum is 62.

The square root of 990859589 is about 31477.9222471878. The cubic root of 990859589 is about 996.9438658924.

The spelling of 990859589 in words is "nine hundred ninety million, eight hundred fifty-nine thousand, five hundred eighty-nine".