12305509 has 2 divisors, whose sum is σ = 12305510. Its totient is φ = 12305508.

The previous prime is 12305471. The next prime is 12305533. The reversal of 12305509 is 90550321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11088900 + 1216609 = 3330^2 + 1103^2 .

It is a cyclic number.

It is not a de Polignac number, because 12305509 - 2¹³ = 12297317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12305539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6152754 + 6152755.

It is an arithmetic number, because the mean of its divisors is an integer number (6152755).

Almost surely, 2^12305509 is an apocalyptic number.

It is an amenable number.

12305509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12305509 is an equidigital number, since it uses as much as digits as its factorization.

12305509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 12305509 is about 3507.9208942050. The cubic root of 12305509 is about 230.8694814371.

The spelling of 12305509 in words is "twelve million, three hundred five thousand, five hundred nine".