111309 has 8 divisors (see below), whose sum is σ = 161952. Its totient is φ = 67440.

The previous prime is 111301. The next prime is 111317. The reversal of 111309 is 903111.

It is an interprime number because it is at equal distance from previous prime (111301) and next prime (111317).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 111309 - 2³ = 111301 is a prime.

It is a Curzon number.

111309 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1654 + ... + 1719.

It is an arithmetic number, because the mean of its divisors is an integer number (20244).

2¹¹¹³⁰⁹ is an apocalyptic number.

It is an amenable number.

111309 is a deficient number, since it is larger than the sum of its proper divisors (50643).

111309 is a wasteful number, since it uses less digits than its factorization.

111309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3387.

The product of its (nonzero) digits is 27, while the sum is 15.

The square root of 111309 is about 333.6300346192. The cubic root of 111309 is about 48.1035092666.

The spelling of 111309 in words is "one hundred eleven thousand, three hundred nine".