135511555 has 4 divisors (see below), whose sum is σ = 162613872. Its totient is φ = 108409240.

The previous prime is 135511549. The next prime is 135511627. The reversal of 135511555 is 555115531.

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

It is not a de Polignac number, because 135511555 - 2⁹ = 135511043 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13551151 + ... + 13551160.

It is an arithmetic number, because the mean of its divisors is an integer number (40653468).

Almost surely, 2^135511555 is an apocalyptic number.

135511555 is a deficient number, since it is larger than the sum of its proper divisors (27102317).

135511555 is an equidigital number, since it uses as much as digits as its factorization.

135511555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27102316.

The product of its digits is 9375, while the sum is 31.

The square root of 135511555 is about 11640.9430459907. The cubic root of 135511555 is about 513.6399278356.

The spelling of 135511555 in words is "one hundred thirty-five million, five hundred eleven thousand, five hundred fifty-five".