12311609 has 2 divisors, whose sum is σ = 12311610. Its totient is φ = 12311608.

The previous prime is 12311599. The next prime is 12311617. The reversal of 12311609 is 90611321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8970025 + 3341584 = 2995^2 + 1828^2 .

It is an emirp because it is prime and its reverse (90611321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12311609 is a prime.

It is not a weakly prime, because it can be changed into another prime (12311699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6155804 + 6155805.

It is an arithmetic number, because the mean of its divisors is an integer number (6155805).

Almost surely, 2^12311609 is an apocalyptic number.

It is an amenable number.

12311609 is a deficient number, since it is larger than the sum of its proper divisors (1).

12311609 is an equidigital number, since it uses as much as digits as its factorization.

12311609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 12311609 is about 3508.7902473645. The cubic root of 12311609 is about 230.9076234649.

The spelling of 12311609 in words is "twelve million, three hundred eleven thousand, six hundred nine".