116538209 has 2 divisors, whose sum is σ = 116538210. Its totient is φ = 116538208.

The previous prime is 116538203. The next prime is 116538293. The reversal of 116538209 is 902835611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109139809 + 7398400 = 10447^2 + 2720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-116538209 is a prime.

It is not a weakly prime, because it can be changed into another prime (116538203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58269104 + 58269105.

It is an arithmetic number, because the mean of its divisors is an integer number (58269105).

Almost surely, 2^116538209 is an apocalyptic number.

It is an amenable number.

116538209 is a deficient number, since it is larger than the sum of its proper divisors (1).

116538209 is an equidigital number, since it uses as much as digits as its factorization.

116538209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 116538209 is about 10795.2864251024. The cubic root of 116538209 is about 488.4529983026.

The spelling of 116538209 in words is "one hundred sixteen million, five hundred thirty-eight thousand, two hundred nine".