115309 has 2 divisors, whose sum is σ = 115310. Its totient is φ = 115308.

The previous prime is 115303. The next prime is 115319. The reversal of 115309 is 903511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77284 + 38025 = 278^2 + 195^2 .

It is a cyclic number.

It is not a de Polignac number, because 115309 - 2³ = 115301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57654 + 57655.

It is an arithmetic number, because the mean of its divisors is an integer number (57655).

2¹¹⁵³⁰⁹ is an apocalyptic number.

It is an amenable number.

115309 is a deficient number, since it is larger than the sum of its proper divisors (1).

115309 is an equidigital number, since it uses as much as digits as its factorization.

115309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 135, while the sum is 19.

The square root of 115309 is about 339.5717891698. The cubic root of 115309 is about 48.6729574237.

It can be divided in two parts, 115 and 309, that added together give a palindrome (424).

The spelling of 115309 in words is "one hundred fifteen thousand, three hundred nine".