13279721449 has 2 divisors, whose sum is σ = 13279721450. Its totient is φ = 13279721448.

The previous prime is 13279721447. The next prime is 13279721537. The reversal of 13279721449 is 94412797231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7679893225 + 5599828224 = 87635^2 + 74832^2 .

It is a cyclic number.

It is not a de Polignac number, because 13279721449 - 2¹ = 13279721447 is a prime.

Together with 13279721447, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13279721447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6639860724 + 6639860725.

It is an arithmetic number, because the mean of its divisors is an integer number (6639860725).

Almost surely, 2^13279721449 is an apocalyptic number.

It is an amenable number.

13279721449 is a deficient number, since it is larger than the sum of its proper divisors (1).

13279721449 is an equidigital number, since it uses as much as digits as its factorization.

13279721449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 49.

The spelling of 13279721449 in words is "thirteen billion, two hundred seventy-nine million, seven hundred twenty-one thousand, four hundred forty-nine".