8197517809 has 16 divisors (see below), whose sum is σ = 8883645120. Its totient is φ = 7519458240.

The previous prime is 8197517789. The next prime is 8197517813. The reversal of 8197517809 is 9087157918.

It is a cyclic number.

It is not a de Polignac number, because 8197517809 - 2⁵ = 8197517777 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8197517809.

It is not an unprimeable number, because it can be changed into a prime (8197517849) 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 15 ways as a sum of consecutive naturals, for example, 1745154 + ... + 1749844.

It is an arithmetic number, because the mean of its divisors is an integer number (555227820).

Almost surely, 2^8197517809 is an apocalyptic number.

It is an amenable number.

8197517809 is a deficient number, since it is larger than the sum of its proper divisors (686127311).

8197517809 is a wasteful number, since it uses less digits than its factorization.

8197517809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5520.

The product of its (nonzero) digits is 1270080, while the sum is 55.

The square root of 8197517809 is about 90540.1447370171. The cubic root of 8197517809 is about 2016.3261826591.

The spelling of 8197517809 in words is "eight billion, one hundred ninety-seven million, five hundred seventeen thousand, eight hundred nine".