12805631243 has 4 divisors (see below), whose sum is σ = 12807406488. Its totient is φ = 12803856000.

The previous prime is 12805631231. The next prime is 12805631281. The reversal of 12805631243 is 34213650821.

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 12805631243 - 2⁴ = 12805631227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12805631203) 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, 876758 + ... + 891243.

It is an arithmetic number, because the mean of its divisors is an integer number (3201851622).

Almost surely, 2^12805631243 is an apocalyptic number.

12805631243 is a deficient number, since it is larger than the sum of its proper divisors (1775245).

12805631243 is an equidigital number, since it uses as much as digits as its factorization.

12805631243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775244.

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 12805631243 in words is "twelve billion, eight hundred five million, six hundred thirty-one thousand, two hundred forty-three".