209089 has 2 divisors, whose sum is σ = 209090. Its totient is φ = 209088.

The previous prime is 209071. The next prime is 209123. The reversal of 209089 is 980902.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172225 + 36864 = 415^2 + 192^2 .

It is a cyclic number.

It is not a de Polignac number, because 209089 - 2⁷ = 208961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (209029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104544 + 104545.

It is an arithmetic number, because the mean of its divisors is an integer number (104545).

2²⁰⁹⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

209089 is a deficient number, since it is larger than the sum of its proper divisors (1).

209089 is an equidigital number, since it uses as much as digits as its factorization.

209089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 209089 is about 457.2625066633. The cubic root of 209089 is about 59.3531439410.

The spelling of 209089 in words is "two hundred nine thousand, eighty-nine".