113503 has 4 divisors (see below), whose sum is σ = 122248. Its totient is φ = 104760.

The previous prime is 113501. The next prime is 113513. The reversal of 113503 is 305311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 305311 = 19 ⋅16069.

It is a cyclic number.

It is not a de Polignac number, because 113503 - 2¹ = 113501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 8731 = 113503 / (1 + 1 + 3 + 5 + 0 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4353 + ... + 4378.

It is an arithmetic number, because the mean of its divisors is an integer number (30562).

2¹¹³⁵⁰³ is an apocalyptic number.

113503 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

113503 is a deficient number, since it is larger than the sum of its proper divisors (8745).

113503 is an equidigital number, since it uses as much as digits as its factorization.

113503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8744.

The product of its (nonzero) digits is 45, while the sum is 13.

The square root of 113503 is about 336.9020629204. The cubic root of 113503 is about 48.4175095449.

Adding to 113503 its reverse (305311), we get a palindrome (418814).

It can be divided in two parts, 113 and 503, that added together give a palindrome (616).

The spelling of 113503 in words is "one hundred thirteen thousand, five hundred three".