12983981 has 4 divisors (see below), whose sum is σ = 12991392. Its totient is φ = 12976572.

The previous prime is 12983977. The next prime is 12983987. The reversal of 12983981 is 18938921.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12983981 - 2² = 12983977 is a prime.

It is a super-2 number, since 2×12983981² = 337167525216722, 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 (12983987) 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, 560 + ... + 5126.

It is an arithmetic number, because the mean of its divisors is an integer number (3247848).

Almost surely, 2^12983981 is an apocalyptic number.

It is an amenable number.

12983981 is a deficient number, since it is larger than the sum of its proper divisors (7411).

12983981 is an equidigital number, since it uses as much as digits as its factorization.

12983981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7410.

The product of its digits is 31104, while the sum is 41.

The square root of 12983981 is about 3603.3291551009. The cubic root of 12983981 is about 235.0368495104.

The spelling of 12983981 in words is "twelve million, nine hundred eighty-three thousand, nine hundred eighty-one".