12117605 has 4 divisors (see below), whose sum is σ = 14541132. Its totient is φ = 9694080.

The previous prime is 12117571. The next prime is 12117607. The reversal of 12117605 is 50671121.

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 2979076 + 9138529 = 1726^2 + 3023^2 .

It is not a de Polignac number, because 12117605 - 2¹⁰ = 12116581 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 (12117607) 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 3 ways as a sum of consecutive naturals, for example, 1211756 + ... + 1211765.

It is an arithmetic number, because the mean of its divisors is an integer number (3635283).

Almost surely, 2^12117605 is an apocalyptic number.

It is an amenable number.

12117605 is a deficient number, since it is larger than the sum of its proper divisors (2423527).

12117605 is an equidigital number, since it uses as much as digits as its factorization.

12117605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423526.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 12117605 is about 3481.0350472237. The cubic root of 12117605 is about 229.6883302143.

Adding to 12117605 its reverse (50671121), we get a palindrome (62788726).

The spelling of 12117605 in words is "twelve million, one hundred seventeen thousand, six hundred five".