12065509 has 2 divisors, whose sum is σ = 12065510. Its totient is φ = 12065508.

The previous prime is 12065507. The next prime is 12065519. The reversal of 12065509 is 90556021.

12065509 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., 8105409 + 3960100 = 2847^2 + 1990^2 .

It is a cyclic number.

It is not a de Polignac number, because 12065509 - 2¹ = 12065507 is a prime.

Together with 12065507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12065507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6032754 + 6032755.

It is an arithmetic number, because the mean of its divisors is an integer number (6032755).

Almost surely, 2^12065509 is an apocalyptic number.

It is an amenable number.

12065509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12065509 is an equidigital number, since it uses as much as digits as its factorization.

12065509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 12065509 is about 3473.5441554700. The cubic root of 12065509 is about 229.3586987354.

The spelling of 12065509 in words is "twelve million, sixty-five thousand, five hundred nine".