12861515 has 16 divisors (see below), whose sum is σ = 15932928. Its totient is φ = 9961056.

The previous prime is 12861493. The next prime is 12861517. The reversal of 12861515 is 51516821.

It is a cyclic number.

It is not a de Polignac number, because 12861515 - 2⁸ = 12861259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12861517) 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, 34862 + ... + 35228.

It is an arithmetic number, because the mean of its divisors is an integer number (995808).

Almost surely, 2^12861515 is an apocalyptic number.

12861515 is a deficient number, since it is larger than the sum of its proper divisors (3071413).

12861515 is a wasteful number, since it uses less digits than its factorization.

12861515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578.

The product of its digits is 2400, while the sum is 29.

The square root of 12861515 is about 3586.2954423750. The cubic root of 12861515 is about 234.2955515012.

The spelling of 12861515 in words is "twelve million, eight hundred sixty-one thousand, five hundred fifteen".