209528089 has 2 divisors, whose sum is σ = 209528090. Its totient is φ = 209528088.

The previous prime is 209528087. The next prime is 209528093. The reversal of 209528089 is 980825902.

209528089 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., 164865600 + 44662489 = 12840^2 + 6683^2 .

It is a cyclic number.

It is not a de Polignac number, because 209528089 - 2¹ = 209528087 is a prime.

Together with 209528087, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (209528087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104764044 + 104764045.

It is an arithmetic number, because the mean of its divisors is an integer number (104764045).

Almost surely, 2^209528089 is an apocalyptic number.

It is an amenable number.

209528089 is a deficient number, since it is larger than the sum of its proper divisors (1).

209528089 is an equidigital number, since it uses as much as digits as its factorization.

209528089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 209528089 is about 14475.0851120123. The cubic root of 209528089 is about 593.9466229098.

The spelling of 209528089 in words is "two hundred nine million, five hundred twenty-eight thousand, eighty-nine".