209641089 has 8 divisors (see below), whose sum is σ = 319453120. Its totient is φ = 119794896.

The previous prime is 209641031. The next prime is 209641097. The reversal of 209641089 is 980146902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 209641089 - 2⁷ = 209640961 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (209640089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4991434 + ... + 4991475.

It is an arithmetic number, because the mean of its divisors is an integer number (39931640).

Almost surely, 2^209641089 is an apocalyptic number.

It is an amenable number.

209641089 is a deficient number, since it is larger than the sum of its proper divisors (109812031).

209641089 is an equidigital number, since it uses as much as digits as its factorization.

209641089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9982919.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 209641089 is about 14478.9878444593. The cubic root of 209641089 is about 594.0533769445.

The spelling of 209641089 in words is "two hundred nine million, six hundred forty-one thousand, eighty-nine".