899209 has 2 divisors, whose sum is σ = 899210. Its totient is φ = 899208.

The previous prime is 899189. The next prime is 899221. The reversal of 899209 is 902998.

899209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 861184 + 38025 = 928^2 + 195^2 .

It is a cyclic number.

It is not a de Polignac number, because 899209 - 2⁵ = 899177 is a prime.

899209 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (899009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449604 + 449605.

It is an arithmetic number, because the mean of its divisors is an integer number (449605).

2⁸⁹⁹²⁰⁹ is an apocalyptic number.

It is an amenable number.

899209 is a deficient number, since it is larger than the sum of its proper divisors (1).

899209 is an equidigital number, since it uses as much as digits as its factorization.

899209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 899209 is about 948.2663128046. The cubic root of 899209 is about 96.5206449069.

The spelling of 899209 in words is "eight hundred ninety-nine thousand, two hundred nine".