135121055 has 4 divisors (see below), whose sum is σ = 162145272. Its totient is φ = 108096840.

The previous prime is 135121043. The next prime is 135121057. The reversal of 135121055 is 550121531.

It is a happy number.

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

It is not a de Polignac number, because 135121055 - 2¹⁰ = 135120031 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135121055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135121057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13512101 + ... + 13512110.

It is an arithmetic number, because the mean of its divisors is an integer number (40536318).

Almost surely, 2^135121055 is an apocalyptic number.

135121055 is a deficient number, since it is larger than the sum of its proper divisors (27024217).

135121055 is an equidigital number, since it uses as much as digits as its factorization.

135121055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27024216.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 135121055 is about 11624.1582490949. The cubic root of 135121055 is about 513.1460723705.

Adding to 135121055 its reverse (550121531), we get a palindrome (685242586).

The spelling of 135121055 in words is "one hundred thirty-five million, one hundred twenty-one thousand, fifty-five".