12719981 has 4 divisors (see below), whose sum is σ = 12805500. Its totient is φ = 12634464.

The previous prime is 12719977. The next prime is 12720011. The reversal of 12719981 is 18991721.

12719981 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 532900 + 12187081 = 730^2 + 3491^2 .

It is a cyclic number.

It is not a de Polignac number, because 12719981 - 2² = 12719977 is a prime.

It is a super-2 number, since 2×12719981² = 323595833280722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12716981) 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, 42536 + ... + 42833.

It is an arithmetic number, because the mean of its divisors is an integer number (3201375).

Almost surely, 2^12719981 is an apocalyptic number.

It is an amenable number.

12719981 is a deficient number, since it is larger than the sum of its proper divisors (85519).

12719981 is an equidigital number, since it uses as much as digits as its factorization.

12719981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85518.

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

The square root of 12719981 is about 3566.5082363567. The cubic root of 12719981 is about 233.4329477161.

The spelling of 12719981 in words is "twelve million, seven hundred nineteen thousand, nine hundred eighty-one".