12665129 has 4 divisors (see below), whose sum is σ = 12672384. Its totient is φ = 12657876.

The previous prime is 12665123. The next prime is 12665131. The reversal of 12665129 is 92156621.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12665129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12665095 and 12665104.

It is not an unprimeable number, because it can be changed into a prime (12665123) 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, 764 + ... + 5090.

It is an arithmetic number, because the mean of its divisors is an integer number (3168096).

Almost surely, 2^12665129 is an apocalyptic number.

It is an amenable number.

12665129 is a deficient number, since it is larger than the sum of its proper divisors (7255).

12665129 is an equidigital number, since it uses as much as digits as its factorization.

12665129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7254.

The product of its digits is 6480, while the sum is 32.

The square root of 12665129 is about 3558.8100539366. The cubic root of 12665129 is about 233.0969222294.

The spelling of 12665129 in words is "twelve million, six hundred sixty-five thousand, one hundred twenty-nine".