13128281009 has 2 divisors, whose sum is σ = 13128281010. Its totient is φ = 13128281008.

The previous prime is 13128281003. The next prime is 13128281011. The reversal of 13128281009 is 90018282131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12830545984 + 297735025 = 113272^2 + 17255^2 .

It is a cyclic number.

It is not a de Polignac number, because 13128281009 - 2²⁸ = 12859845553 is a prime.

Together with 13128281011, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13128281009.

It is not a weakly prime, because it can be changed into another prime (13128281003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6564140504 + 6564140505.

It is an arithmetic number, because the mean of its divisors is an integer number (6564140505).

Almost surely, 2^13128281009 is an apocalyptic number.

It is an amenable number.

13128281009 is a deficient number, since it is larger than the sum of its proper divisors (1).

13128281009 is an equidigital number, since it uses as much as digits as its factorization.

13128281009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 35.

The spelling of 13128281009 in words is "thirteen billion, one hundred twenty-eight million, two hundred eighty-one thousand, nine".