115109 has 4 divisors (see below), whose sum is σ = 117120. Its totient is φ = 113100.

The previous prime is 115099. The next prime is 115117. The reversal of 115109 is 901511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 917 + ... + 1034.

It is an arithmetic number, because the mean of its divisors is an integer number (29280).

2¹¹⁵¹⁰⁹ is an apocalyptic number.

It is an amenable number.

115109 is a deficient number, since it is larger than the sum of its proper divisors (2011).

115109 is an equidigital number, since it uses as much as digits as its factorization.

115109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010.

The product of its (nonzero) digits is 45, while the sum is 17.

The square root of 115109 is about 339.2771728248. The cubic root of 115109 is about 48.6448005437.

The spelling of 115109 in words is "one hundred fifteen thousand, one hundred nine".