117185209 has 4 divisors (see below), whose sum is σ = 119106340. Its totient is φ = 115264080.

The previous prime is 117185171. The next prime is 117185213. The reversal of 117185209 is 902581711.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32490000 + 84695209 = 5700^2 + 9203^2 .

It is a cyclic number.

It is not a de Polignac number, because 117185209 - 2¹¹ = 117183161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117185249) 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, 960474 + ... + 960595.

It is an arithmetic number, because the mean of its divisors is an integer number (29776585).

Almost surely, 2^117185209 is an apocalyptic number.

It is an amenable number.

117185209 is a deficient number, since it is larger than the sum of its proper divisors (1921131).

117185209 is an equidigital number, since it uses as much as digits as its factorization.

117185209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921130.

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 117185209 is about 10825.2117300310. The cubic root of 117185209 is about 489.3552661611.

The spelling of 117185209 in words is "one hundred seventeen million, one hundred eighty-five thousand, two hundred nine".