12730834561 has 3 divisors (see below), whose sum is σ = 12730947393. Its totient is φ = 12730721730.

The previous prime is 12730834507. The next prime is 12730834579. The reversal of 12730834561 is 16543803721.

The square root of 12730834561 is 112831.

It is a perfect power (a square), and thus also a powerful number.

12730834561 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 brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 12730834561 - 2⁷ = 12730834433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12730835561) 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 2 ways as a sum of consecutive naturals, for example, 56416 + ... + 169246.

It is an arithmetic number, because the mean of its divisors is an integer number (4243649131).

Almost surely, 2^12730834561 is an apocalyptic number.

12730834561 is the 112831-st square number.

12730834561 is the 56416-th centered octagonal number.

It is an amenable number.

12730834561 is a deficient number, since it is larger than the sum of its proper divisors (112832).

12730834561 is an frugal number, since it uses more digits than its factorization.

12730834561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225662 (or 112831 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 12730834561 in words is "twelve billion, seven hundred thirty million, eight hundred thirty-four thousand, five hundred sixty-one".