208189 has 2 divisors, whose sum is σ = 208190. Its totient is φ = 208188.

The previous prime is 208147. The next prime is 208207. The reversal of 208189 is 981802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136900 + 71289 = 370^2 + 267^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208189 is a prime.

208189 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104094 + 104095.

It is an arithmetic number, because the mean of its divisors is an integer number (104095).

2²⁰⁸¹⁸⁹ is an apocalyptic number.

It is an amenable number.

208189 is a deficient number, since it is larger than the sum of its proper divisors (1).

208189 is an equidigital number, since it uses as much as digits as its factorization.

208189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 208189 is about 456.2773279487. The cubic root of 208189 is about 59.2678618250.

The spelling of 208189 in words is "two hundred eight thousand, one hundred eighty-nine".