117131818 has 8 divisors (see below), whose sum is σ = 175743648. Its totient is φ = 58550604.

The previous prime is 117131813. The next prime is 117131831. The reversal of 117131818 is 818131711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 117131818.

It is not an unprimeable number, because it can be changed into a prime (117131813) 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, 11355 + ... + 19057.

It is an arithmetic number, because the mean of its divisors is an integer number (21967956).

Almost surely, 2^117131818 is an apocalyptic number.

117131818 is a deficient number, since it is larger than the sum of its proper divisors (58611830).

117131818 is an equidigital number, since it uses as much as digits as its factorization.

117131818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15308.

The product of its digits is 1344, while the sum is 31.

The square root of 117131818 is about 10822.7454003132. The cubic root of 117131818 is about 489.2809361435.

It can be divided in two parts, 11713 and 1818, that added together give a palindrome (13531).

The spelling of 117131818 in words is "one hundred seventeen million, one hundred thirty-one thousand, eight hundred eighteen".