8685109209 has 96 divisors (see below), whose sum is σ = 14956057600. Its totient is φ = 4378199040.

The previous prime is 8685109207. The next prime is 8685109231. The reversal of 8685109209 is 9029015868.

It is a happy number.

It is not a de Polignac number, because 8685109209 - 2¹ = 8685109207 is a prime.

It is a super-2 number, since 2×8685109209² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8685109201) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12568554 + ... + 12569244.

Almost surely, 2^8685109209 is an apocalyptic number.

It is an amenable number.

8685109209 is a deficient number, since it is larger than the sum of its proper divisors (6270948391).

8685109209 is a wasteful number, since it uses less digits than its factorization.

8685109209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863 (or 846 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 48.

The square root of 8685109209 is about 93193.9333272290. The cubic root of 8685109209 is about 2055.5360345911.

The spelling of 8685109209 in words is "eight billion, six hundred eighty-five million, one hundred nine thousand, two hundred nine".