135605109 has 8 divisors (see below), whose sum is σ = 190323040. Its totient is φ = 85645296.

The previous prime is 135605027. The next prime is 135605123. The reversal of 135605109 is 901506531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 135605109 - 2⁷ = 135604981 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 (135605149) 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 7 ways as a sum of consecutive naturals, for example, 1189462 + ... + 1189575.

It is an arithmetic number, because the mean of its divisors is an integer number (23790380).

Almost surely, 2^135605109 is an apocalyptic number.

135605109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

135605109 is a deficient number, since it is larger than the sum of its proper divisors (54717931).

135605109 is a wasteful number, since it uses less digits than its factorization.

135605109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2379059.

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 135605109 is about 11644.9606697490. The cubic root of 135605109 is about 513.7581022988.

The spelling of 135605109 in words is "one hundred thirty-five million, six hundred five thousand, one hundred nine".