12971217 has 8 divisors (see below), whose sum is σ = 19765696. Its totient is φ = 7412112.

The previous prime is 12971213. The next prime is 12971219. The reversal of 12971217 is 71217921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12971217 - 2² = 12971213 is a prime.

It is a super-2 number, since 2×12971217² = 336504940922178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12971213) 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 7 ways as a sum of consecutive naturals, for example, 308818 + ... + 308859.

It is an arithmetic number, because the mean of its divisors is an integer number (2470712).

Almost surely, 2^12971217 is an apocalyptic number.

It is an amenable number.

12971217 is a deficient number, since it is larger than the sum of its proper divisors (6794479).

12971217 is an equidigital number, since it uses as much as digits as its factorization.

12971217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617687.

The product of its digits is 1764, while the sum is 30.

The square root of 12971217 is about 3601.5575797146. The cubic root of 12971217 is about 234.9598060124.

The spelling of 12971217 in words is "twelve million, nine hundred seventy-one thousand, two hundred seventeen".