13428509 has 2 divisors, whose sum is σ = 13428510. Its totient is φ = 13428508.

The previous prime is 13428491. The next prime is 13428529. The reversal of 13428509 is 90582431.

13428509 is digitally balanced in base 3, 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., 13344409 + 84100 = 3653^2 + 290^2 .

It is an emirp because it is prime and its reverse (90582431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13428509 - 2¹² = 13424413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13428529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6714254 + 6714255.

It is an arithmetic number, because the mean of its divisors is an integer number (6714255).

Almost surely, 2^13428509 is an apocalyptic number.

It is an amenable number.

13428509 is a deficient number, since it is larger than the sum of its proper divisors (1).

13428509 is an equidigital number, since it uses as much as digits as its factorization.

13428509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 13428509 is about 3664.4930072249. The cubic root of 13428509 is about 237.6890992593.

The spelling of 13428509 in words is "thirteen million, four hundred twenty-eight thousand, five hundred nine".