12971065 has 4 divisors (see below), whose sum is σ = 15565284. Its totient is φ = 10376848.

The previous prime is 12971041. The next prime is 12971069. The reversal of 12971065 is 56017921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6335289 + 6635776 = 2517^2 + 2576^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12971065 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12971069) 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, 1297102 + ... + 1297111.

It is an arithmetic number, because the mean of its divisors is an integer number (3891321).

Almost surely, 2^12971065 is an apocalyptic number.

It is an amenable number.

12971065 is a deficient number, since it is larger than the sum of its proper divisors (2594219).

12971065 is an equidigital number, since it uses as much as digits as its factorization.

12971065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2594218.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 12971065 is about 3601.5364776717. The cubic root of 12971065 is about 234.9588882360.

Adding to 12971065 its reverse (56017921), we get a palindrome (68988986).

The spelling of 12971065 in words is "twelve million, nine hundred seventy-one thousand, sixty-five".