8917799809 has 4 divisors (see below), whose sum is σ = 8918088004. Its totient is φ = 8917511616.

The previous prime is 8917799801. The next prime is 8917799887. The reversal of 8917799809 is 9089977198.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9089977198 = 2 ⋅4544988599.

It can be written as a sum of positive squares in 2 ways, for example, as 4249084225 + 4668715584 = 65185^2 + 68328^2 .

It is a cyclic number.

It is not a de Polignac number, because 8917799809 - 2³ = 8917799801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8917799801) 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, 91212 + ... + 161725.

It is an arithmetic number, because the mean of its divisors is an integer number (2229522001).

Almost surely, 2^8917799809 is an apocalyptic number.

It is an amenable number.

8917799809 is a deficient number, since it is larger than the sum of its proper divisors (288195).

8917799809 is a wasteful number, since it uses less digits than its factorization.

8917799809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288194.

The product of its (nonzero) digits is 20575296, while the sum is 67.

The square root of 8917799809 is about 94434.1029978048. The cubic root of 8917799809 is about 2073.7317306301.

The spelling of 8917799809 in words is "eight billion, nine hundred seventeen million, seven hundred ninety-nine thousand, eight hundred nine".