12911663 has 4 divisors (see below), whose sum is σ = 12932448. Its totient is φ = 12890880.

The previous prime is 12911651. The next prime is 12911683. The reversal of 12911663 is 36611921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36611921 = 277 ⋅132173.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12911663 is a prime.

It is a super-2 number, since 2×12911663² = 333422082851138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12911623) 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, 9431 + ... + 10712.

It is an arithmetic number, because the mean of its divisors is an integer number (3233112).

Almost surely, 2^12911663 is an apocalyptic number.

12911663 is a deficient number, since it is larger than the sum of its proper divisors (20785).

12911663 is an equidigital number, since it uses as much as digits as its factorization.

12911663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20784.

The product of its digits is 1944, while the sum is 29.

The square root of 12911663 is about 3593.2802562561. The cubic root of 12911663 is about 234.5996684902.

The spelling of 12911663 in words is "twelve million, nine hundred eleven thousand, six hundred sixty-three".