117638109 has 8 divisors (see below), whose sum is σ = 174278720. Its totient is φ = 78425388.

The previous prime is 117638107. The next prime is 117638161. The reversal of 117638109 is 901836711.

117638109 is a `hidden beast` number, since 1 + 1 + 7 + 638 + 10 + 9 = 666.

It is not a de Polignac number, because 117638109 - 2¹ = 117638107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117638107) 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 in 7 ways as a sum of consecutive naturals, for example, 2178457 + ... + 2178510.

It is an arithmetic number, because the mean of its divisors is an integer number (21784840).

Almost surely, 2^117638109 is an apocalyptic number.

It is an amenable number.

117638109 is a deficient number, since it is larger than the sum of its proper divisors (56640611).

117638109 is an equidigital number, since it uses as much as digits as its factorization.

117638109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4356976 (or 4356970 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 117638109 is about 10846.1103166066. The cubic root of 117638109 is about 489.9848794446.

The spelling of 117638109 in words is "one hundred seventeen million, six hundred thirty-eight thousand, one hundred nine".