135121525303 has 4 divisors (see below), whose sum is σ = 135139508280. Its totient is φ = 135103542328.

The previous prime is 135121525283. The next prime is 135121525333. The reversal of 135121525303 is 303525121531.

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 135121525303 - 2⁵ = 135121525271 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 (135121525333) 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, 8980213 + ... + 8995246.

It is an arithmetic number, because the mean of its divisors is an integer number (33784877070).

Almost surely, 2^135121525303 is an apocalyptic number.

135121525303 is a deficient number, since it is larger than the sum of its proper divisors (17982977).

135121525303 is an equidigital number, since it uses as much as digits as its factorization.

135121525303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17982976.

The product of its (nonzero) digits is 13500, while the sum is 31.

Adding to 135121525303 its reverse (303525121531), we get a palindrome (438646646834).

The spelling of 135121525303 in words is "one hundred thirty-five billion, one hundred twenty-one million, five hundred twenty-five thousand, three hundred three".