12847661 has 4 divisors (see below), whose sum is σ = 12859872. Its totient is φ = 12835452.

The previous prime is 12847651. The next prime is 12847673. The reversal of 12847661 is 16674821.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16674821 = 281 ⋅59341.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12847661 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 (12847651) 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, 4361 + ... + 6686.

It is an arithmetic number, because the mean of its divisors is an integer number (3214968).

Almost surely, 2^12847661 is an apocalyptic number.

It is an amenable number.

12847661 is a deficient number, since it is larger than the sum of its proper divisors (12211).

12847661 is a wasteful number, since it uses less digits than its factorization.

12847661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12210.

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

The square root of 12847661 is about 3584.3634023352. The cubic root of 12847661 is about 234.2113961292.

The spelling of 12847661 in words is "twelve million, eight hundred forty-seven thousand, six hundred sixty-one".