2117791118 has 4 divisors (see below), whose sum is σ = 3176686680. Its totient is φ = 1058895558.

The previous prime is 2117791111. The next prime is 2117791121. The reversal of 2117791118 is 8111977112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117791111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 529447778 + ... + 529447781.

It is an arithmetic number, because the mean of its divisors is an integer number (794171670).

Almost surely, 2^2117791118 is an apocalyptic number.

2117791118 is a deficient number, since it is larger than the sum of its proper divisors (1058895562).

2117791118 is a wasteful number, since it uses less digits than its factorization.

2117791118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058895561.

The product of its digits is 7056, while the sum is 38.

The square root of 2117791118 is about 46019.4645557725. The cubic root of 2117791118 is about 1284.1853391844.

The spelling of 2117791118 in words is "two billion, one hundred seventeen million, seven hundred ninety-one thousand, one hundred eighteen".