12681965 has 4 divisors (see below), whose sum is σ = 15218364. Its totient is φ = 10145568.

The previous prime is 12681959. The next prime is 12682001. The reversal of 12681965 is 56918621.

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 1943236 + 10738729 = 1394^2 + 3277^2 .

It is a cyclic number.

It is not a de Polignac number, because 12681965 - 2⁸ = 12681709 is a prime.

It is a super-2 number, since 2×12681965² = 321664472522450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1268192 + ... + 1268201.

It is an arithmetic number, because the mean of its divisors is an integer number (3804591).

Almost surely, 2^12681965 is an apocalyptic number.

It is an amenable number.

12681965 is a deficient number, since it is larger than the sum of its proper divisors (2536399).

12681965 is an equidigital number, since it uses as much as digits as its factorization.

12681965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2536398.

The product of its digits is 25920, while the sum is 38.

The square root of 12681965 is about 3561.1746657529. The cubic root of 12681965 is about 233.2001632395.

The spelling of 12681965 in words is "twelve million, six hundred eighty-one thousand, nine hundred sixty-five".