12802981 has 4 divisors (see below), whose sum is σ = 12811500. Its totient is φ = 12794464.

The previous prime is 12802961. The next prime is 12802987. The reversal of 12802981 is 18920821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10956100 + 1846881 = 3310^2 + 1359^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12802981 is a prime.

It is a super-2 number, since 2×12802981² = 327832644972722, 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 (12802987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1336 + ... + 5233.

It is an arithmetic number, because the mean of its divisors is an integer number (3202875).

Almost surely, 2^12802981 is an apocalyptic number.

It is an amenable number.

12802981 is a deficient number, since it is larger than the sum of its proper divisors (8519).

12802981 is an equidigital number, since it uses as much as digits as its factorization.

12802981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8518.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 12802981 is about 3578.1253471616. The cubic root of 12802981 is about 233.9395770160.

The spelling of 12802981 in words is "twelve million, eight hundred two thousand, nine hundred eighty-one".