115805609 has 2 divisors, whose sum is σ = 115805610. Its totient is φ = 115805608.

The previous prime is 115805587. The next prime is 115805611. The reversal of 115805609 is 906508511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114490000 + 1315609 = 10700^2 + 1147^2 .

It is an emirp because it is prime and its reverse (906508511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 115805609 - 2⁸ = 115805353 is a prime.

Together with 115805611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (115805629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57902804 + 57902805.

It is an arithmetic number, because the mean of its divisors is an integer number (57902805).

Almost surely, 2^115805609 is an apocalyptic number.

It is an amenable number.

115805609 is a deficient number, since it is larger than the sum of its proper divisors (1).

115805609 is an equidigital number, since it uses as much as digits as its factorization.

115805609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 115805609 is about 10761.3014547498. The cubic root of 115805609 is about 487.4273171500.

The spelling of 115805609 in words is "one hundred fifteen million, eight hundred five thousand, six hundred nine".