12991163 has 2 divisors, whose sum is σ = 12991164. Its totient is φ = 12991162.

The previous prime is 12991157. The next prime is 12991171. The reversal of 12991163 is 36119921.

It is a weak prime.

It is an emirp because it is prime and its reverse (36119921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12991163 - 2¹⁰ = 12990139 is a prime.

It is not a weakly prime, because it can be changed into another prime (12991103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6495581 + 6495582.

It is an arithmetic number, because the mean of its divisors is an integer number (6495582).

Almost surely, 2^12991163 is an apocalyptic number.

12991163 is a deficient number, since it is larger than the sum of its proper divisors (1).

12991163 is an equidigital number, since it uses as much as digits as its factorization.

12991163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 32.

The square root of 12991163 is about 3604.3255957252. The cubic root of 12991163 is about 235.0801778627.

The spelling of 12991163 in words is "twelve million, nine hundred ninety-one thousand, one hundred sixty-three".