115806109 has 2 divisors, whose sum is σ = 115806110. Its totient is φ = 115806108.

The previous prime is 115806059. The next prime is 115806133. The reversal of 115806109 is 901608511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113316025 + 2490084 = 10645^2 + 1578^2 .

It is an emirp because it is prime and its reverse (901608511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 115806109 - 2⁷ = 115805981 is a prime.

It is a super-2 number, since 2×115806109² = 26822109763439762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115806139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57903054 + 57903055.

It is an arithmetic number, because the mean of its divisors is an integer number (57903055).

Almost surely, 2^115806109 is an apocalyptic number.

It is an amenable number.

115806109 is a deficient number, since it is larger than the sum of its proper divisors (1).

115806109 is an equidigital number, since it uses as much as digits as its factorization.

115806109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 115806109 is about 10761.3246861156. The cubic root of 115806109 is about 487.4280186512.

It can be divided in two parts, 11580 and 6109, that added together give a square (17689 = 133²).

The spelling of 115806109 in words is "one hundred fifteen million, eight hundred six thousand, one hundred nine".