117912218 has 4 divisors (see below), whose sum is σ = 176868330. Its totient is φ = 58956108.

The previous prime is 117912217. The next prime is 117912241. The reversal of 117912218 is 812219711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 812219711 = 149 ⋅5451139.

It can be written as a sum of positive squares in only one way, i.e., 117787609 + 124609 = 10853^2 + 353^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (117912217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 29478053 + ... + 29478056.

Almost surely, 2^117912218 is an apocalyptic number.

117912218 is a deficient number, since it is larger than the sum of its proper divisors (58956112).

117912218 is an equidigital number, since it uses as much as digits as its factorization.

117912218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58956111.

The product of its digits is 2016, while the sum is 32.

The square root of 117912218 is about 10858.7392454189. The cubic root of 117912218 is about 490.3651561058.

The spelling of 117912218 in words is "one hundred seventeen million, nine hundred twelve thousand, two hundred eighteen".