12387631849 has 2 divisors, whose sum is σ = 12387631850. Its totient is φ = 12387631848.

The previous prime is 12387631829. The next prime is 12387631897. The reversal of 12387631849 is 94813678321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10752238249 + 1635393600 = 103693^2 + 40440^2 .

It is an emirp because it is prime and its reverse (94813678321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12387631849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12387631796 and 12387631805.

It is not a weakly prime, because it can be changed into another prime (12387631829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6193815924 + 6193815925.

It is an arithmetic number, because the mean of its divisors is an integer number (6193815925).

Almost surely, 2^12387631849 is an apocalyptic number.

It is an amenable number.

12387631849 is a deficient number, since it is larger than the sum of its proper divisors (1).

12387631849 is an equidigital number, since it uses as much as digits as its factorization.

12387631849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 52.

The spelling of 12387631849 in words is "twelve billion, three hundred eighty-seven million, six hundred thirty-one thousand, eight hundred forty-nine".