12691127 has 4 divisors (see below), whose sum is σ = 12700656. Its totient is φ = 12681600.

The previous prime is 12691109. The next prime is 12691169. The reversal of 12691127 is 72119621.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12691127 - 2¹⁰ = 12690103 is a prime.

It is a super-2 number, since 2×12691127² = 322129409060258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12691127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12691187) 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 3 ways as a sum of consecutive naturals, for example, 2363 + ... + 5564.

It is an arithmetic number, because the mean of its divisors is an integer number (3175164).

Almost surely, 2^12691127 is an apocalyptic number.

12691127 is a deficient number, since it is larger than the sum of its proper divisors (9529).

12691127 is an equidigital number, since it uses as much as digits as its factorization.

12691127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9528.

The product of its digits is 1512, while the sum is 29.

The square root of 12691127 is about 3562.4608068019. The cubic root of 12691127 is about 233.2563076824.

The spelling of 12691127 in words is "twelve million, six hundred ninety-one thousand, one hundred twenty-seven".