12215717 has 4 divisors (see below), whose sum is σ = 12270720. Its totient is φ = 12160716.

The previous prime is 12215713. The next prime is 12215743. The reversal of 12215717 is 71751221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71751221 = 593 ⋅120997.

It is a cyclic number.

It is not a de Polignac number, because 12215717 - 2² = 12215713 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 (12215713) 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, 27167 + ... + 27612.

It is an arithmetic number, because the mean of its divisors is an integer number (3067680).

Almost surely, 2^12215717 is an apocalyptic number.

It is an amenable number.

12215717 is a deficient number, since it is larger than the sum of its proper divisors (55003).

12215717 is an equidigital number, since it uses as much as digits as its factorization.

12215717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55002.

The product of its digits is 980, while the sum is 26.

The square root of 12215717 is about 3495.0989971673. The cubic root of 12215717 is about 230.3065666216.

Adding to 12215717 its reverse (71751221), we get a palindrome (83966938).

The spelling of 12215717 in words is "twelve million, two hundred fifteen thousand, seven hundred seventeen".