209016969809 has 8 divisors (see below), whose sum is σ = 213889058592. Its totient is φ = 204145391520.

The previous prime is 209016969769. The next prime is 209016969827. The reversal of 209016969809 is 908969610902.

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

It is a cyclic number.

It is not a de Polignac number, because 209016969809 - 2²⁸ = 208748534353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209016962809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 774197 + ... + 1008669.

It is an arithmetic number, because the mean of its divisors is an integer number (26736132324).

Almost surely, 2^209016969809 is an apocalyptic number.

It is an amenable number.

209016969809 is a deficient number, since it is larger than the sum of its proper divisors (4872088783).

209016969809 is a wasteful number, since it uses less digits than its factorization.

209016969809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255247.

The product of its (nonzero) digits is 3779136, while the sum is 59.

The spelling of 209016969809 in words is "two hundred nine billion, sixteen million, nine hundred sixty-nine thousand, eight hundred nine".