12981971 has 4 divisors (see below), whose sum is σ = 13033944. Its totient is φ = 12930000.

The previous prime is 12981967. The next prime is 12981973. The reversal of 12981971 is 17918921.

12981971 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 is a cyclic number.

It is not a de Polignac number, because 12981971 - 2² = 12981967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12981973) 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, 25610 + ... + 26111.

It is an arithmetic number, because the mean of its divisors is an integer number (3258486).

Almost surely, 2^12981971 is an apocalyptic number.

12981971 is a deficient number, since it is larger than the sum of its proper divisors (51973).

12981971 is an equidigital number, since it uses as much as digits as its factorization.

12981971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51972.

The product of its digits is 9072, while the sum is 38.

The square root of 12981971 is about 3603.0502355643. The cubic root of 12981971 is about 235.0247205019.

The spelling of 12981971 in words is "twelve million, nine hundred eighty-one thousand, nine hundred seventy-one".