12736981 has 4 divisors (see below), whose sum is σ = 12782272. Its totient is φ = 12691692.

The previous prime is 12736949. The next prime is 12737033. The reversal of 12736981 is 18963721.

12736981 is digitally balanced in base 2, 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12736981 - 2⁵ = 12736949 is a prime.

It is a super-2 number, since 2×12736981² = 324461369988722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12736981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12736921) 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, 22221 + ... + 22786.

It is an arithmetic number, because the mean of its divisors is an integer number (3195568).

Almost surely, 2^12736981 is an apocalyptic number.

12736981 is the 2061-st hex number.

It is an amenable number.

12736981 is a deficient number, since it is larger than the sum of its proper divisors (45291).

12736981 is an equidigital number, since it uses as much as digits as its factorization.

12736981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45290.

The product of its digits is 18144, while the sum is 37.

The square root of 12736981 is about 3568.8907240206. The cubic root of 12736981 is about 233.5368942431.

The spelling of 12736981 in words is "twelve million, seven hundred thirty-six thousand, nine hundred eighty-one".