13509645349 has 2 divisors, whose sum is σ = 13509645350. Its totient is φ = 13509645348.

The previous prime is 13509645343. The next prime is 13509645367. The reversal of 13509645349 is 94354690531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6978096225 + 6531549124 = 83535^2 + 80818^2 .

It is a cyclic number.

It is not a de Polignac number, because 13509645349 - 2²⁷ = 13375427621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13509645343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6754822674 + 6754822675.

It is an arithmetic number, because the mean of its divisors is an integer number (6754822675).

Almost surely, 2^13509645349 is an apocalyptic number.

It is an amenable number.

13509645349 is a deficient number, since it is larger than the sum of its proper divisors (1).

13509645349 is an equidigital number, since it uses as much as digits as its factorization.

13509645349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1749600, while the sum is 49.

The spelling of 13509645349 in words is "thirteen billion, five hundred nine million, six hundred forty-five thousand, three hundred forty-nine".