13128025849 has 2 divisors, whose sum is σ = 13128025850. Its totient is φ = 13128025848.

The previous prime is 13128025847. The next prime is 13128025871. The reversal of 13128025849 is 94852082131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10932166249 + 2195859600 = 104557^2 + 46860^2 .

It is a cyclic number.

It is not a de Polignac number, because 13128025849 - 2¹ = 13128025847 is a prime.

Together with 13128025847, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13128025847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6564012924 + 6564012925.

It is an arithmetic number, because the mean of its divisors is an integer number (6564012925).

Almost surely, 2^13128025849 is an apocalyptic number.

It is an amenable number.

13128025849 is a deficient number, since it is larger than the sum of its proper divisors (1).

13128025849 is an equidigital number, since it uses as much as digits as its factorization.

13128025849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 13128025849 in words is "thirteen billion, one hundred twenty-eight million, twenty-five thousand, eight hundred forty-nine".