999869089 has 2 divisors, whose sum is σ = 999869090. Its totient is φ = 999869088.

The previous prime is 999869081. The next prime is 999869107. The reversal of 999869089 is 980968999.

999869089 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., 515517025 + 484352064 = 22705^2 + 22008^2 .

It is a cyclic number.

It is not a de Polignac number, because 999869089 - 2³ = 999869081 is a prime.

It is not a weakly prime, because it can be changed into another prime (999869081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499934544 + 499934545.

It is an arithmetic number, because the mean of its divisors is an integer number (499934545).

Almost surely, 2^999869089 is an apocalyptic number.

It is an amenable number.

999869089 is a deficient number, since it is larger than the sum of its proper divisors (1).

999869089 is an equidigital number, since it uses as much as digits as its factorization.

999869089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22674816, while the sum is 67.

The square root of 999869089 is about 31620.7066492828. The cubic root of 999869089 is about 999.9563610957.

The spelling of 999869089 in words is "nine hundred ninety-nine million, eight hundred sixty-nine thousand, eighty-nine".