12180517 has 4 divisors (see below), whose sum is σ = 12897036. Its totient is φ = 11464000.

The previous prime is 12180503. The next prime is 12180527. The reversal of 12180517 is 71508121.

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 9728161 + 2452356 = 3119^2 + 1566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12180517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12180491 and 12180500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12180527) 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, 358234 + ... + 358267.

It is an arithmetic number, because the mean of its divisors is an integer number (3224259).

Almost surely, 2^12180517 is an apocalyptic number.

12180517 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

12180517 is a deficient number, since it is larger than the sum of its proper divisors (716519).

12180517 is an equidigital number, since it uses as much as digits as its factorization.

12180517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716518.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 12180517 is about 3490.0597416090. The cubic root of 12180517 is about 230.0851417611.

Adding to 12180517 its reverse (71508121), we get a palindrome (83688638).

The spelling of 12180517 in words is "twelve million, one hundred eighty thousand, five hundred seventeen".