12661487 has 8 divisors (see below), whose sum is σ = 13141440. Its totient is φ = 12184480.

The previous prime is 12661483. The next prime is 12661499. The reversal of 12661487 is 78416621.

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 12661487 - 2² = 12661483 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 (12661483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11993 + ... + 13005.

It is an arithmetic number, because the mean of its divisors is an integer number (1642680).

Almost surely, 2^12661487 is an apocalyptic number.

12661487 is a deficient number, since it is larger than the sum of its proper divisors (479953).

12661487 is a wasteful number, since it uses less digits than its factorization.

12661487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473.

The product of its digits is 16128, while the sum is 35.

The square root of 12661487 is about 3558.2983292580. The cubic root of 12661487 is about 233.0745768753.

The spelling of 12661487 in words is "twelve million, six hundred sixty-one thousand, four hundred eighty-seven".