113605 has 4 divisors (see below), whose sum is σ = 136332. Its totient is φ = 90880.

The previous prime is 113591. The next prime is 113621. The reversal of 113605 is 506311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42849 + 70756 = 207^2 + 266^2 .

It is not a de Polignac number, because 113605 - 2⁹ = 113093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 11356 + ... + 11365.

It is an arithmetic number, because the mean of its divisors is an integer number (34083).

2¹¹³⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

113605 is a deficient number, since it is larger than the sum of its proper divisors (22727).

113605 is an equidigital number, since it uses as much as digits as its factorization.

113605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22726.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 113605 is about 337.0534082308. The cubic root of 113605 is about 48.4320087427.

Adding to 113605 its reverse (506311), we get a palindrome (619916).

The spelling of 113605 in words is "one hundred thirteen thousand, six hundred five".