12731065 has 4 divisors (see below), whose sum is σ = 15277284. Its totient is φ = 10184848.

The previous prime is 12731063. The next prime is 12731093. The reversal of 12731065 is 56013721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56013721 = 3299 ⋅16979.

It can be written as a sum of positive squares in 2 ways, for example, as 4511376 + 8219689 = 2124^2 + 2867^2 .

It is a cyclic number.

It is not a de Polignac number, because 12731065 - 2¹ = 12731063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12731063) 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, 1273102 + ... + 1273111.

It is an arithmetic number, because the mean of its divisors is an integer number (3819321).

Almost surely, 2^12731065 is an apocalyptic number.

It is an amenable number.

12731065 is a deficient number, since it is larger than the sum of its proper divisors (2546219).

12731065 is an equidigital number, since it uses as much as digits as its factorization.

12731065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2546218.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 12731065 is about 3568.0617987922. The cubic root of 12731065 is about 233.5007313505.

Adding to 12731065 its reverse (56013721), we get a palindrome (68744786).

The spelling of 12731065 in words is "twelve million, seven hundred thirty-one thousand, sixty-five".