135206303 has 4 divisors (see below), whose sum is σ = 135235920. Its totient is φ = 135176688.

The previous prime is 135206257. The next prime is 135206327. The reversal of 135206303 is 303602531.

135206303 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 303602531 = 97 ⋅3129923.

It is a cyclic number.

It is not a de Polignac number, because 135206303 - 2⁸ = 135206047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135206333) 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, 6350 + ... + 17627.

It is an arithmetic number, because the mean of its divisors is an integer number (33808980).

Almost surely, 2^135206303 is an apocalyptic number.

135206303 is a deficient number, since it is larger than the sum of its proper divisors (29617).

135206303 is an equidigital number, since it uses as much as digits as its factorization.

135206303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29616.

The product of its (nonzero) digits is 1620, while the sum is 23.

The square root of 135206303 is about 11627.8245170797. The cubic root of 135206303 is about 513.2539644630.

Adding to 135206303 its reverse (303602531), we get a palindrome (438808834).

The spelling of 135206303 in words is "one hundred thirty-five million, two hundred six thousand, three hundred three".