12187878841 has 2 divisors, whose sum is σ = 12187878842. Its totient is φ = 12187878840.

The previous prime is 12187878809. The next prime is 12187878877. The reversal of 12187878841 is 14887878121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6659212816 + 5528666025 = 81604^2 + 74355^2 .

It is a cyclic number.

It is not a de Polignac number, because 12187878841 - 2⁵ = 12187878809 is a prime.

It is not a weakly prime, because it can be changed into another prime (12187878341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6093939420 + 6093939421.

It is an arithmetic number, because the mean of its divisors is an integer number (6093939421).

Almost surely, 2^12187878841 is an apocalyptic number.

It is an amenable number.

12187878841 is a deficient number, since it is larger than the sum of its proper divisors (1).

12187878841 is an equidigital number, since it uses as much as digits as its factorization.

12187878841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1605632, while the sum is 55.

The spelling of 12187878841 in words is "twelve billion, one hundred eighty-seven million, eight hundred seventy-eight thousand, eight hundred forty-one".