135603 has 24 divisors (see below), whose sum is σ = 225680. Its totient is φ = 77760.

The previous prime is 135601. The next prime is 135607. The reversal of 135603 is 306531.

It is not a de Polignac number, because 135603 - 2¹ = 135601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2193 + ... + 2253.

2¹³⁵⁶⁰³ is an apocalyptic number.

135603 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

135603 is a deficient number, since it is larger than the sum of its proper divisors (90077).

135603 is a wasteful number, since it uses less digits than its factorization.

135603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 135603 is about 368.2431262088. The cubic root of 135603 is about 51.3755438875.

The spelling of 135603 in words is "one hundred thirty-five thousand, six hundred three".