12185224981 has 2 divisors, whose sum is σ = 12185224982. Its totient is φ = 12185224980.

The previous prime is 12185224847. The next prime is 12185225009. The reversal of 12185224981 is 18942258121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8919102481 + 3266122500 = 94441^2 + 57150^2 .

It is an emirp because it is prime and its reverse (18942258121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12185224981 - 2¹³ = 12185216789 is a prime.

It is a super-2 number, since 2×12185224981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12185224781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6092612490 + 6092612491.

It is an arithmetic number, because the mean of its divisors is an integer number (6092612491).

Almost surely, 2^12185224981 is an apocalyptic number.

It is an amenable number.

12185224981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12185224981 is an equidigital number, since it uses as much as digits as its factorization.

12185224981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 43.

The spelling of 12185224981 in words is "twelve billion, one hundred eighty-five million, two hundred twenty-four thousand, nine hundred eighty-one".