12618217 has 4 divisors (see below), whose sum is σ = 12652420. Its totient is φ = 12584016.

The previous prime is 12618211. The next prime is 12618239. The reversal of 12618217 is 71281621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71281621 = 79 ⋅902299.

It can be written as a sum of positive squares in 2 ways, for example, as 8042896 + 4575321 = 2836^2 + 2139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12618217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12618211) 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, 16542 + ... + 17287.

It is an arithmetic number, because the mean of its divisors is an integer number (3163105).

Almost surely, 2^12618217 is an apocalyptic number.

It is an amenable number.

12618217 is a deficient number, since it is larger than the sum of its proper divisors (34203).

12618217 is an equidigital number, since it uses as much as digits as its factorization.

12618217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34202.

The product of its digits is 1344, while the sum is 28.

The square root of 12618217 is about 3552.2129722189. The cubic root of 12618217 is about 232.8087669356.

Adding to 12618217 its reverse (71281621), we get a palindrome (83899838).

The spelling of 12618217 in words is "twelve million, six hundred eighteen thousand, two hundred seventeen".