12817217 has 16 divisors (see below), whose sum is σ = 15325440. Its totient is φ = 10487232.

The previous prime is 12817213. The next prime is 12817307. The reversal of 12817217 is 71271821.

It is not a de Polignac number, because 12817217 - 2² = 12817213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12817217.

It is not an unprimeable number, because it can be changed into a prime (12817213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20603 + ... + 21215.

It is an arithmetic number, because the mean of its divisors is an integer number (957840).

Almost surely, 2^12817217 is an apocalyptic number.

It is an amenable number.

12817217 is a deficient number, since it is larger than the sum of its proper divisors (2508223).

12817217 is a wasteful number, since it uses less digits than its factorization.

12817217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752.

The product of its digits is 1568, while the sum is 29.

The square root of 12817217 is about 3580.1141043268. The cubic root of 12817217 is about 234.0262529291.

The spelling of 12817217 in words is "twelve million, eight hundred seventeen thousand, two hundred seventeen".