12661517 has 4 divisors (see below), whose sum is σ = 13812576. Its totient is φ = 11510460.

The previous prime is 12661499. The next prime is 12661589. The reversal of 12661517 is 71516621.

12661517 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12661517 - 2⁸ = 12661261 is a prime.

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 12661517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12664517) 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, 575513 + ... + 575534.

It is an arithmetic number, because the mean of its divisors is an integer number (3453144).

Almost surely, 2^12661517 is an apocalyptic number.

It is an amenable number.

12661517 is a deficient number, since it is larger than the sum of its proper divisors (1151059).

12661517 is a wasteful number, since it uses less digits than its factorization.

12661517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151058.

The product of its digits is 2520, while the sum is 29.

The square root of 12661517 is about 3558.3025447536. The cubic root of 12661517 is about 233.0747609567.

The spelling of 12661517 in words is "twelve million, six hundred sixty-one thousand, five hundred seventeen".