13503 has 8 divisors (see below), whose sum is σ = 20608. Its totient is φ = 7704.

The previous prime is 13499. The next prime is 13513. The reversal of 13503 is 30531.

It is a happy number.

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

It is not a de Polignac number, because 13503 - 2² = 13499 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13513) 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, 301 + ... + 342.

It is an arithmetic number, because the mean of its divisors is an integer number (2576).

2¹³⁵⁰³ is an apocalyptic number.

13503 is a deficient number, since it is larger than the sum of its proper divisors (7105).

13503 is an equidigital number, since it uses as much as digits as its factorization.

13503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653.

The product of its (nonzero) digits is 45, while the sum is 12.

The square root of 13503 is about 116.2024096136. The cubic root of 13503 is about 23.8127794278.

The spelling of 13503 in words is "thirteen thousand, five hundred three".