12279617281 has 4 divisors (see below), whose sum is σ = 12282824772. Its totient is φ = 12276409792.

The previous prime is 12279617279. The next prime is 12279617309. The reversal of 12279617281 is 18271697221.

12279617281 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 8653650625 + 3625966656 = 93025^2 + 60216^2 .

It is a cyclic number.

It is not a de Polignac number, because 12279617281 - 2¹ = 12279617279 is a prime.

It is a super-2 number, since 2×12279617281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12279617221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1597996 + ... + 1605661.

It is an arithmetic number, because the mean of its divisors is an integer number (3070706193).

Almost surely, 2^12279617281 is an apocalyptic number.

It is an amenable number.

12279617281 is a deficient number, since it is larger than the sum of its proper divisors (3207491).

12279617281 is an equidigital number, since it uses as much as digits as its factorization.

12279617281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3207490.

The product of its digits is 169344, while the sum is 46.

The spelling of 12279617281 in words is "twelve billion, two hundred seventy-nine million, six hundred seventeen thousand, two hundred eighty-one".