117209 has 2 divisors, whose sum is σ = 117210. Its totient is φ = 117208.

The previous prime is 117203. The next prime is 117223. The reversal of 117209 is 902711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78400 + 38809 = 280^2 + 197^2 .

It is a cyclic number.

It is not a de Polignac number, because 117209 - 2⁴ = 117193 is a prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (117203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58604 + 58605.

It is an arithmetic number, because the mean of its divisors is an integer number (58605).

2¹¹⁷²⁰⁹ is an apocalyptic number.

It is an amenable number.

117209 is a deficient number, since it is larger than the sum of its proper divisors (1).

117209 is an equidigital number, since it uses as much as digits as its factorization.

117209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 117209 is about 342.3579997605. The cubic root of 117209 is about 48.9388380304.

The spelling of 117209 in words is "one hundred seventeen thousand, two hundred nine".