133503 has 4 divisors (see below), whose sum is σ = 178008. Its totient is φ = 89000.

The previous prime is 133499. The next prime is 133519. The reversal of 133503 is 305331.

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

It is a cyclic number.

It is not a de Polignac number, because 133503 - 2² = 133499 is a prime.

It is a D-number.

133503 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22248 + ... + 22253.

It is an arithmetic number, because the mean of its divisors is an integer number (44502).

2¹³³⁵⁰³ is an apocalyptic number.

133503 is a deficient number, since it is larger than the sum of its proper divisors (44505).

133503 is an equidigital number, since it uses as much as digits as its factorization.

133503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44504.

The product of its (nonzero) digits is 135, while the sum is 15.

The square root of 133503 is about 365.3806234600. The cubic root of 133503 is about 51.1089558357.

Adding to 133503 its reverse (305331), we get a palindrome (438834).

It can be divided in two parts, 133 and 503, that added together give a palindrome (636).

The spelling of 133503 in words is "one hundred thirty-three thousand, five hundred three".