12788981 has 4 divisors (see below), whose sum is σ = 13541292. Its totient is φ = 12036672.

The previous prime is 12788977. The next prime is 12788999. The reversal of 12788981 is 18988721.

12788981 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.

It can be written as a sum of positive squares in 2 ways, for example, as 10923025 + 1865956 = 3305^2 + 1366^2 .

It is a cyclic number.

It is not a de Polignac number, because 12788981 - 2² = 12788977 is a prime.

It is a super-2 number, since 2×12788981² = 327116070036722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12787981) 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, 376130 + ... + 376163.

It is an arithmetic number, because the mean of its divisors is an integer number (3385323).

Almost surely, 2^12788981 is an apocalyptic number.

It is an amenable number.

12788981 is a deficient number, since it is larger than the sum of its proper divisors (752311).

12788981 is an equidigital number, since it uses as much as digits as its factorization.

12788981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752310.

The product of its digits is 64512, while the sum is 44.

The square root of 12788981 is about 3576.1684803711. The cubic root of 12788981 is about 233.8542753040.

The spelling of 12788981 in words is "twelve million, seven hundred eighty-eight thousand, nine hundred eighty-one".