209275189 has 2 divisors, whose sum is σ = 209275190. Its totient is φ = 209275188.

The previous prime is 209275181. The next prime is 209275207. The reversal of 209275189 is 981572902.

209275189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155002500 + 54272689 = 12450^2 + 7367^2 .

It is a cyclic number.

It is not a de Polignac number, because 209275189 - 2³ = 209275181 is a prime.

It is a super-2 number, since 2×209275189² = 87592209461971442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209275181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104637594 + 104637595.

It is an arithmetic number, because the mean of its divisors is an integer number (104637595).

Almost surely, 2^209275189 is an apocalyptic number.

It is an amenable number.

209275189 is a deficient number, since it is larger than the sum of its proper divisors (1).

209275189 is an equidigital number, since it uses as much as digits as its factorization.

209275189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 209275189 is about 14466.3467744970. The cubic root of 209275189 is about 593.7075625588.

The spelling of 209275189 in words is "two hundred nine million, two hundred seventy-five thousand, one hundred eighty-nine".