135505121 has 8 divisors (see below), whose sum is σ = 142720704. Its totient is φ = 128399920.

The previous prime is 135505109. The next prime is 135505127. The reversal of 135505121 is 121505531.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 135505121 - 2¹⁸ = 135242977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (135505127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25070 + ... + 29991.

It is an arithmetic number, because the mean of its divisors is an integer number (17840088).

Almost surely, 2^135505121 is an apocalyptic number.

It is an amenable number.

135505121 is a deficient number, since it is larger than the sum of its proper divisors (7215583).

135505121 is a wasteful number, since it uses less digits than its factorization.

135505121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55191.

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

The square root of 135505121 is about 11640.6666905294. Note that the first 4 decimals coincide. The cubic root of 135505121 is about 513.6317986110.

The spelling of 135505121 in words is "one hundred thirty-five million, five hundred five thousand, one hundred twenty-one".