113309 has 4 divisors (see below), whose sum is σ = 129504. Its totient is φ = 97116.

The previous prime is 113287. The next prime is 113327. The reversal of 113309 is 903311.

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-113309 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8087 + ... + 8100.

It is an arithmetic number, because the mean of its divisors is an integer number (32376).

2¹¹³³⁰⁹ is an apocalyptic number.

It is an amenable number.

113309 is a deficient number, since it is larger than the sum of its proper divisors (16195).

113309 is an equidigital number, since it uses as much as digits as its factorization.

113309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16194.

The product of its (nonzero) digits is 81, while the sum is 17.

The square root of 113309 is about 336.6140222867. The cubic root of 113309 is about 48.3899086490.

The spelling of 113309 in words is "one hundred thirteen thousand, three hundred nine".