117185947 has 4 divisors (see below), whose sum is σ = 124079256. Its totient is φ = 110292640.

The previous prime is 117185927. The next prime is 117185953. The reversal of 117185947 is 749581711.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117185947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117185917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3446629 + ... + 3446662.

It is an arithmetic number, because the mean of its divisors is an integer number (31019814).

Almost surely, 2^117185947 is an apocalyptic number.

117185947 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

117185947 is a deficient number, since it is larger than the sum of its proper divisors (6893309).

117185947 is an equidigital number, since it uses as much as digits as its factorization.

117185947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6893308.

The product of its digits is 70560, while the sum is 43.

The square root of 117185947 is about 10825.2458170704. The cubic root of 117185947 is about 489.3562934336.

The spelling of 117185947 in words is "one hundred seventeen million, one hundred eighty-five thousand, nine hundred forty-seven".