2117808859 has 4 divisors (see below), whose sum is σ = 2118016080. Its totient is φ = 2117601640.

The previous prime is 2117808817. The next prime is 2117808877. The reversal of 2117808859 is 9588087112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2117808859 - 2⁷ = 2117808731 is a prime.

It is a super-2 number, since 2×2117808859² = 8970228726517763762, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2117808659) 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, 87439 + ... + 109000.

It is an arithmetic number, because the mean of its divisors is an integer number (529504020).

Almost surely, 2^2117808859 is an apocalyptic number.

2117808859 is a deficient number, since it is larger than the sum of its proper divisors (207221).

2117808859 is a wasteful number, since it uses less digits than its factorization.

2117808859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207220.

The product of its (nonzero) digits is 322560, while the sum is 49.

The square root of 2117808859 is about 46019.6573107623. The cubic root of 2117808859 is about 1284.1889251012.

The spelling of 2117808859 in words is "two billion, one hundred seventeen million, eight hundred eight thousand, eight hundred fifty-nine".