13509989 has 2 divisors, whose sum is σ = 13509990. Its totient is φ = 13509988.

The previous prime is 13509983. The next prime is 13510001. The reversal of 13509989 is 98990531.

13509989 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., 13322500 + 187489 = 3650^2 + 433^2 .

It is a cyclic number.

It is not a de Polignac number, because 13509989 - 2⁴ = 13509973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13509983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6754994 + 6754995.

It is an arithmetic number, because the mean of its divisors is an integer number (6754995).

Almost surely, 2^13509989 is an apocalyptic number.

It is an amenable number.

13509989 is a deficient number, since it is larger than the sum of its proper divisors (1).

13509989 is an equidigital number, since it uses as much as digits as its factorization.

13509989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 13509989 is about 3675.5936935412. The cubic root of 13509989 is about 238.1688712761.

The spelling of 13509989 in words is "thirteen million, five hundred nine thousand, nine hundred eighty-nine".