12861517 has 2 divisors, whose sum is σ = 12861518. Its totient is φ = 12861516.

The previous prime is 12861493. The next prime is 12861553. The reversal of 12861517 is 71516821.

12861517 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12716356 + 145161 = 3566^2 + 381^2 .

It is a cyclic number.

It is not a de Polignac number, because 12861517 - 2¹⁹ = 12337229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12861557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6430758 + 6430759.

It is an arithmetic number, because the mean of its divisors is an integer number (6430759).

Almost surely, 2^12861517 is an apocalyptic number.

It is an amenable number.

12861517 is a deficient number, since it is larger than the sum of its proper divisors (1).

12861517 is an equidigital number, since it uses as much as digits as its factorization.

12861517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 31.

The square root of 12861517 is about 3586.2957212143. The cubic root of 12861517 is about 234.2955636457.

The spelling of 12861517 in words is "twelve million, eight hundred sixty-one thousand, five hundred seventeen".