209834189 has 2 divisors, whose sum is σ = 209834190. Its totient is φ = 209834188.

The previous prime is 209834173. The next prime is 209834197. The reversal of 209834189 is 981438902.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205692964 + 4141225 = 14342^2 + 2035^2 .

It is a cyclic number.

It is not a de Polignac number, because 209834189 - 2⁴ = 209834173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209834089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104917094 + 104917095.

It is an arithmetic number, because the mean of its divisors is an integer number (104917095).

Almost surely, 2^209834189 is an apocalyptic number.

It is an amenable number.

209834189 is a deficient number, since it is larger than the sum of its proper divisors (1).

209834189 is an equidigital number, since it uses as much as digits as its factorization.

209834189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 209834189 is about 14485.6545934245. The cubic root of 209834189 is about 594.2357147763.

The spelling of 209834189 in words is "two hundred nine million, eight hundred thirty-four thousand, one hundred eighty-nine".