12541224181 has 2 divisors, whose sum is σ = 12541224182. Its totient is φ = 12541224180.

The previous prime is 12541224161. The next prime is 12541224233. The reversal of 12541224181 is 18142214521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12299919025 + 241305156 = 110905^2 + 15534^2 .

It is a cyclic number.

It is not a de Polignac number, because 12541224181 - 2⁵ = 12541224149 is a prime.

It is a super-2 number, since 2×12541224181² (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 (12541224131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6270612090 + 6270612091.

It is an arithmetic number, because the mean of its divisors is an integer number (6270612091).

Almost surely, 2^12541224181 is an apocalyptic number.

It is an amenable number.

12541224181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12541224181 is an equidigital number, since it uses as much as digits as its factorization.

12541224181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5120, while the sum is 31.

The spelling of 12541224181 in words is "twelve billion, five hundred forty-one million, two hundred twenty-four thousand, one hundred eighty-one".