12651917 has 4 divisors (see below), whose sum is σ = 13088220. Its totient is φ = 12215616.

The previous prime is 12651907. The next prime is 12651923. The reversal of 12651917 is 71915621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71915621 = 29 ⋅2479849.

It can be written as a sum of positive squares in 2 ways, for example, as 9916201 + 2735716 = 3149^2 + 1654^2 .

It is a cyclic number.

It is not a de Polignac number, because 12651917 - 2¹⁰ = 12650893 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 (12651907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218108 + ... + 218165.

It is an arithmetic number, because the mean of its divisors is an integer number (3272055).

Almost surely, 2^12651917 is an apocalyptic number.

It is an amenable number.

12651917 is a deficient number, since it is larger than the sum of its proper divisors (436303).

12651917 is an equidigital number, since it uses as much as digits as its factorization.

12651917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436302.

The product of its digits is 3780, while the sum is 32.

The square root of 12651917 is about 3556.9533311529. The cubic root of 12651917 is about 233.0158400696.

The spelling of 12651917 in words is "twelve million, six hundred fifty-one thousand, nine hundred seventeen".