12305647281 has 4 divisors (see below), whose sum is σ = 16407529712. Its totient is φ = 8203764852.

The previous prime is 12305647267. The next prime is 12305647297. The reversal of 12305647281 is 18274650321.

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 not a de Polignac number, because 12305647281 - 2⁷ = 12305647153 is a prime.

It is a super-2 number, since 2×12305647281² (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 (12305647201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2050941211 + ... + 2050941216.

It is an arithmetic number, because the mean of its divisors is an integer number (4101882428).

Almost surely, 2^12305647281 is an apocalyptic number.

It is an amenable number.

12305647281 is a deficient number, since it is larger than the sum of its proper divisors (4101882431).

12305647281 is an equidigital number, since it uses as much as digits as its factorization.

12305647281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4101882430.

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 12305647281 in words is "twelve billion, three hundred five million, six hundred forty-seven thousand, two hundred eighty-one".