12863661 has 4 divisors (see below), whose sum is σ = 17151552. Its totient is φ = 8575772.

The previous prime is 12863657. The next prime is 12863671. The reversal of 12863661 is 16636821.

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 12863661 - 2² = 12863657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12863671) 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, 2143941 + ... + 2143946.

It is an arithmetic number, because the mean of its divisors is an integer number (4287888).

Almost surely, 2^12863661 is an apocalyptic number.

It is an amenable number.

12863661 is a deficient number, since it is larger than the sum of its proper divisors (4287891).

12863661 is an equidigital number, since it uses as much as digits as its factorization.

12863661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4287890.

The product of its digits is 10368, while the sum is 33.

The square root of 12863661 is about 3586.5946244314. The cubic root of 12863661 is about 234.3085818555.

The spelling of 12863661 in words is "twelve million, eight hundred sixty-three thousand, six hundred sixty-one".