999785089 has 2 divisors, whose sum is σ = 999785090. Its totient is φ = 999785088.

The previous prime is 999785077. The next prime is 999785153. The reversal of 999785089 is 980587999.

It is an a-pointer prime, because the next prime (999785153) can be obtained adding 999785089 to its sum of digits (64).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 798627600 + 201157489 = 28260^2 + 14183^2 .

It is a cyclic number.

It is not a de Polignac number, because 999785089 - 2¹⁷ = 999654017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999785089.

It is not a weakly prime, because it can be changed into another prime (999785789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499892544 + 499892545.

It is an arithmetic number, because the mean of its divisors is an integer number (499892545).

Almost surely, 2^999785089 is an apocalyptic number.

It is an amenable number.

999785089 is a deficient number, since it is larger than the sum of its proper divisors (1).

999785089 is an equidigital number, since it uses as much as digits as its factorization.

999785089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14696640, while the sum is 64.

The square root of 999785089 is about 31619.3783778239. The cubic root of 999785089 is about 999.9283578675.

The spelling of 999785089 in words is "nine hundred ninety-nine million, seven hundred eighty-five thousand, eighty-nine".