13145123449 has 2 divisors, whose sum is σ = 13145123450. Its totient is φ = 13145123448.

The previous prime is 13145123417. The next prime is 13145123501. The reversal of 13145123449 is 94432154131.

13145123449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7862014224 + 5283109225 = 88668^2 + 72685^2 .

It is a cyclic number.

It is not a de Polignac number, because 13145123449 - 2⁵ = 13145123417 is a prime.

It is not a weakly prime, because it can be changed into another prime (13145123149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6572561724 + 6572561725.

It is an arithmetic number, because the mean of its divisors is an integer number (6572561725).

Almost surely, 2^13145123449 is an apocalyptic number.

It is an amenable number.

13145123449 is a deficient number, since it is larger than the sum of its proper divisors (1).

13145123449 is an equidigital number, since it uses as much as digits as its factorization.

13145123449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 37.

The spelling of 13145123449 in words is "thirteen billion, one hundred forty-five million, one hundred twenty-three thousand, four hundred forty-nine".