13509689 has 2 divisors, whose sum is σ = 13509690. Its totient is φ = 13509688.

The previous prime is 13509677. The next prime is 13509757. The reversal of 13509689 is 98690531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8219689 + 5290000 = 2867^2 + 2300^2 .

It is a cyclic number.

It is not a de Polignac number, because 13509689 - 2⁴ = 13509673 is a prime.

It is not a weakly prime, because it can be changed into another prime (13509619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6754844 + 6754845.

It is an arithmetic number, because the mean of its divisors is an integer number (6754845).

Almost surely, 2^13509689 is an apocalyptic number.

It is an amenable number.

13509689 is a deficient number, since it is larger than the sum of its proper divisors (1).

13509689 is an equidigital number, since it uses as much as digits as its factorization.

13509689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 13509689 is about 3675.5528835809. The cubic root of 13509689 is about 238.1671083536.

The spelling of 13509689 in words is "thirteen million, five hundred nine thousand, six hundred eighty-nine".