117838909 has 2 divisors, whose sum is σ = 117838910. Its totient is φ = 117838908.

The previous prime is 117838907. The next prime is 117838921. The reversal of 117838909 is 909838711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115498009 + 2340900 = 10747^2 + 1530^2 .

It is an emirp because it is prime and its reverse (909838711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 117838909 - 2¹ = 117838907 is a prime.

Together with 117838907, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117838907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58919454 + 58919455.

It is an arithmetic number, because the mean of its divisors is an integer number (58919455).

Almost surely, 2^117838909 is an apocalyptic number.

It is an amenable number.

117838909 is a deficient number, since it is larger than the sum of its proper divisors (1).

117838909 is an equidigital number, since it uses as much as digits as its factorization.

117838909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 117838909 is about 10855.3631445475. The cubic root of 117838909 is about 490.2635109091.

The spelling of 117838909 in words is "one hundred seventeen million, eight hundred thirty-eight thousand, nine hundred nine".