12135505 has 4 divisors (see below), whose sum is σ = 14562612. Its totient is φ = 9708400.

The previous prime is 12135499. The next prime is 12135521. The reversal of 12135505 is 50553121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1560001 + 10575504 = 1249^2 + 3252^2 .

It is not a de Polignac number, because 12135505 - 2¹⁹ = 11611217 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1213546 + ... + 1213555.

It is an arithmetic number, because the mean of its divisors is an integer number (3640653).

Almost surely, 2^12135505 is an apocalyptic number.

It is an amenable number.

12135505 is a deficient number, since it is larger than the sum of its proper divisors (2427107).

12135505 is an equidigital number, since it uses as much as digits as its factorization.

12135505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427106.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 12135505 is about 3483.6051728059. The cubic root of 12135505 is about 229.8013723081.

Adding to 12135505 its reverse (50553121), we get a palindrome (62688626).

The spelling of 12135505 in words is "twelve million, one hundred thirty-five thousand, five hundred five".