12145563281 has 2 divisors, whose sum is σ = 12145563282. Its totient is φ = 12145563280.

The previous prime is 12145563229. The next prime is 12145563289. The reversal of 12145563281 is 18236554121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10621363600 + 1524199681 = 103060^2 + 39041^2 .

It is an emirp because it is prime and its reverse (18236554121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12145563281 - 2⁶ = 12145563217 is a prime.

It is a super-2 number, since 2×12145563281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12145563289) 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 as a sum of consecutive naturals, namely, 6072781640 + 6072781641.

It is an arithmetic number, because the mean of its divisors is an integer number (6072781641).

Almost surely, 2^12145563281 is an apocalyptic number.

It is an amenable number.

12145563281 is a deficient number, since it is larger than the sum of its proper divisors (1).

12145563281 is an equidigital number, since it uses as much as digits as its factorization.

12145563281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57600, while the sum is 38.

The spelling of 12145563281 in words is "twelve billion, one hundred forty-five million, five hundred sixty-three thousand, two hundred eighty-one".