12651217 has 8 divisors (see below), whose sum is σ = 12950312. Its totient is φ = 12355200.

The previous prime is 12651203. The next prime is 12651227. The reversal of 12651217 is 71215621.

It can be written as a sum of positive squares in 4 ways, for example, as 707281 + 11943936 = 841^2 + 3456^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12651217 - 2¹⁵ = 12618449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12651191 and 12651200.

It is not an unprimeable number, because it can be changed into a prime (12651227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8917 + ... + 10237.

It is an arithmetic number, because the mean of its divisors is an integer number (1618789).

Almost surely, 2^12651217 is an apocalyptic number.

It is an amenable number.

12651217 is a deficient number, since it is larger than the sum of its proper divisors (299095).

12651217 is a wasteful number, since it uses less digits than its factorization.

12651217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539.

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

The square root of 12651217 is about 3556.8549309748. The cubic root of 12651217 is about 233.0115425892.

Adding to 12651217 its reverse (71215621), we get a palindrome (83866838).

The spelling of 12651217 in words is "twelve million, six hundred fifty-one thousand, two hundred seventeen".