12615217 has 4 divisors (see below), whose sum is σ = 12637296. Its totient is φ = 12593140.

The previous prime is 12615199. The next prime is 12615257. The reversal of 12615217 is 71251621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12615217 - 2⁷ = 12615089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12615191 and 12615200.

It is not an unprimeable number, because it can be changed into a prime (12615257) 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 3 ways as a sum of consecutive naturals, for example, 10159 + ... + 11332.

It is an arithmetic number, because the mean of its divisors is an integer number (3159324).

Almost surely, 2^12615217 is an apocalyptic number.

It is an amenable number.

12615217 is a deficient number, since it is larger than the sum of its proper divisors (22079).

12615217 is an equidigital number, since it uses as much as digits as its factorization.

12615217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22078.

The product of its digits is 840, while the sum is 25.

The square root of 12615217 is about 3551.7906751384. The cubic root of 12615217 is about 232.7903152622.

Adding to 12615217 its reverse (71251621), we get a palindrome (83866838).

The spelling of 12615217 in words is "twelve million, six hundred fifteen thousand, two hundred seventeen".