135605121 has 4 divisors (see below), whose sum is σ = 180806832. Its totient is φ = 90403412.

The previous prime is 135605027. The next prime is 135605123. The reversal of 135605121 is 121506531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 135605121 - 2⁷ = 135604993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135605091 and 135605100.

It is not an unprimeable number, because it can be changed into a prime (135605123) 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, 22600851 + ... + 22600856.

It is an arithmetic number, because the mean of its divisors is an integer number (45201708).

Almost surely, 2^135605121 is an apocalyptic number.

It is an amenable number.

135605121 is a deficient number, since it is larger than the sum of its proper divisors (45201711).

135605121 is an equidigital number, since it uses as much as digits as its factorization.

135605121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45201710.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 135605121 is about 11644.9611849933. The cubic root of 135605121 is about 513.7581174533.

It can be divided in two parts, 13560 and 5121, that added together give a palindrome (18681).

The spelling of 135605121 in words is "one hundred thirty-five million, six hundred five thousand, one hundred twenty-one".