209007089 has 4 divisors (see below), whose sum is σ = 216214260. Its totient is φ = 201799920.

The previous prime is 209007079. The next prime is 209007121. The reversal of 209007089 is 980700902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 164224225 + 44782864 = 12815^2 + 6692^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209007089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209007079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3603542 + ... + 3603599.

It is an arithmetic number, because the mean of its divisors is an integer number (54053565).

Almost surely, 2^209007089 is an apocalyptic number.

209007089 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

209007089 is a deficient number, since it is larger than the sum of its proper divisors (7207171).

209007089 is an equidigital number, since it uses as much as digits as its factorization.

209007089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7207170.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 209007089 is about 14457.0774709137. The cubic root of 209007089 is about 593.4539236090.

The spelling of 209007089 in words is "two hundred nine million, seven thousand, eighty-nine".