12819281 has 4 divisors (see below), whose sum is σ = 13494000. Its totient is φ = 12144564.

The previous prime is 12819197. The next prime is 12819329. The reversal of 12819281 is 18291821.

12819281 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12819281 - 2¹⁴ = 12802897 is a prime.

It is a super-2 number, since 2×12819281² = 328667930713922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12819181) 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, 337331 + ... + 337368.

It is an arithmetic number, because the mean of its divisors is an integer number (3373500).

Almost surely, 2^12819281 is an apocalyptic number.

It is an amenable number.

12819281 is a deficient number, since it is larger than the sum of its proper divisors (674719).

12819281 is an equidigital number, since it uses as much as digits as its factorization.

12819281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674718.

The product of its digits is 2304, while the sum is 32.

The square root of 12819281 is about 3580.4023516918. The cubic root of 12819281 is about 234.0388142690.

The spelling of 12819281 in words is "twelve million, eight hundred nineteen thousand, two hundred eighty-one".