12127129 has 4 divisors (see below), whose sum is σ = 13859584. Its totient is φ = 10394676.

The previous prime is 12127109. The next prime is 12127139. The reversal of 12127129 is 92172121.

12127129 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-12127129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12127109) 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, 866217 + ... + 866230.

It is an arithmetic number, because the mean of its divisors is an integer number (3464896).

Almost surely, 2^12127129 is an apocalyptic number.

It is an amenable number.

12127129 is a deficient number, since it is larger than the sum of its proper divisors (1732455).

12127129 is an equidigital number, since it uses as much as digits as its factorization.

12127129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732454.

The product of its digits is 504, while the sum is 25.

The square root of 12127129 is about 3482.4027624616. The cubic root of 12127129 is about 229.7484900340.

The spelling of 12127129 in words is "twelve million, one hundred twenty-seven thousand, one hundred twenty-nine".