117909209 has 8 divisors (see below), whose sum is σ = 128892000. Its totient is φ = 106970400.

The previous prime is 117909191. The next prime is 117909217. The reversal of 117909209 is 902909711.

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

It is a cyclic number.

It is not a de Polignac number, because 117909209 - 2⁸ = 117908953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117909289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5252 + ... + 16229.

It is an arithmetic number, because the mean of its divisors is an integer number (16111500).

Almost surely, 2^117909209 is an apocalyptic number.

It is an amenable number.

117909209 is a deficient number, since it is larger than the sum of its proper divisors (10982791).

117909209 is a wasteful number, since it uses less digits than its factorization.

117909209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21991.

The product of its (nonzero) digits is 10206, while the sum is 38.

The square root of 117909209 is about 10858.6006925386. The cubic root of 117909209 is about 490.3609848635.

The spelling of 117909209 in words is "one hundred seventeen million, nine hundred nine thousand, two hundred nine".