12971689 has 4 divisors (see below), whose sum is σ = 12978900. Its totient is φ = 12964480.

The previous prime is 12971683. The next prime is 12971743. The reversal of 12971689 is 98617921.

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 can be written as a sum of positive squares in 2 ways, for example, as 1982464 + 10989225 = 1408^2 + 3315^2 .

It is a cyclic number.

It is not a de Polignac number, because 12971689 - 2⁵ = 12971657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12971683) 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, 1569 + ... + 5329.

It is an arithmetic number, because the mean of its divisors is an integer number (3244725).

Almost surely, 2^12971689 is an apocalyptic number.

It is an amenable number.

12971689 is a deficient number, since it is larger than the sum of its proper divisors (7211).

12971689 is an equidigital number, since it uses as much as digits as its factorization.

12971689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7210.

The product of its digits is 54432, while the sum is 43.

The square root of 12971689 is about 3601.6231063230. The cubic root of 12971689 is about 234.9626559039.

The spelling of 12971689 in words is "twelve million, nine hundred seventy-one thousand, six hundred eighty-nine".