209189 has 2 divisors, whose sum is σ = 209190. Its totient is φ = 209188.

The previous prime is 209179. The next prime is 209201. The reversal of 209189 is 981902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146689 + 62500 = 383^2 + 250^2 .

It is a cyclic number.

It is not a de Polignac number, because 209189 - 2⁴ = 209173 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104594 + 104595.

It is an arithmetic number, because the mean of its divisors is an integer number (104595).

2²⁰⁹¹⁸⁹ is an apocalyptic number.

It is an amenable number.

209189 is a deficient number, since it is larger than the sum of its proper divisors (1).

209189 is an equidigital number, since it uses as much as digits as its factorization.

209189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 209189 is about 457.3718399727. The cubic root of 209189 is about 59.3626046147.

The spelling of 209189 in words is "two hundred nine thousand, one hundred eighty-nine".