135121535 has 4 divisors (see below), whose sum is σ = 162145848. Its totient is φ = 108097224.

The previous prime is 135121531. The next prime is 135121541. The reversal of 135121535 is 535121531.

It is a happy number.

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 135121535 - 2² = 135121531 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 (135121531) 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, 13512149 + ... + 13512158.

It is an arithmetic number, because the mean of its divisors is an integer number (40536462).

Almost surely, 2^135121535 is an apocalyptic number.

135121535 is a deficient number, since it is larger than the sum of its proper divisors (27024313).

135121535 is an equidigital number, since it uses as much as digits as its factorization.

135121535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27024312.

The product of its digits is 2250, while the sum is 26.

The square root of 135121535 is about 11624.1788957328. The cubic root of 135121535 is about 513.1466799981.

The spelling of 135121535 in words is "one hundred thirty-five million, one hundred twenty-one thousand, five hundred thirty-five".