12981065 has 4 divisors (see below), whose sum is σ = 15577284. Its totient is φ = 10384848.

The previous prime is 12981011. The next prime is 12981083. The reversal of 12981065 is 56018921.

12981065 is digitally balanced in base 3, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 8667136 + 4313929 = 2944^2 + 2077^2 .

It is a cyclic number.

It is not a de Polignac number, because 12981065 - 2¹⁴ = 12964681 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1298102 + ... + 1298111.

It is an arithmetic number, because the mean of its divisors is an integer number (3894321).

Almost surely, 2^12981065 is an apocalyptic number.

It is an amenable number.

12981065 is a deficient number, since it is larger than the sum of its proper divisors (2596219).

12981065 is an equidigital number, since it uses as much as digits as its factorization.

12981065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2596218.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 12981065 is about 3602.9245065641. The cubic root of 12981065 is about 235.0192529873.

Adding to 12981065 its reverse (56018921), we get a palindrome (68999986).

The spelling of 12981065 in words is "twelve million, nine hundred eighty-one thousand, sixty-five".