115605109 has 2 divisors, whose sum is σ = 115605110. Its totient is φ = 115605108.

The previous prime is 115605097. The next prime is 115605163. The reversal of 115605109 is 901506511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72335025 + 43270084 = 8505^2 + 6578^2 .

It is an emirp because it is prime and its reverse (901506511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 115605109 - 2¹⁹ = 115080821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115605409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57802554 + 57802555.

It is an arithmetic number, because the mean of its divisors is an integer number (57802555).

Almost surely, 2^115605109 is an apocalyptic number.

It is an amenable number.

115605109 is a deficient number, since it is larger than the sum of its proper divisors (1).

115605109 is an equidigital number, since it uses as much as digits as its factorization.

115605109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 28.

The square root of 115605109 is about 10751.9816313087. The cubic root of 115605109 is about 487.1458522786.

The spelling of 115605109 in words is "one hundred fifteen million, six hundred five thousand, one hundred nine".