12311809 has 2 divisors, whose sum is σ = 12311810. Its totient is φ = 12311808.

The previous prime is 12311797. The next prime is 12311821. The reversal of 12311809 is 90811321.

It is a balanced prime because it is at equal distance from previous prime (12311797) and next prime (12311821).

It can be written as a sum of positive squares in only one way, i.e., 9284209 + 3027600 = 3047^2 + 1740^2 .

It is an emirp because it is prime and its reverse (90811321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12311809 - 2⁵ = 12311777 is a prime.

It is not a weakly prime, because it can be changed into another prime (12311839) 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, 6155904 + 6155905.

It is an arithmetic number, because the mean of its divisors is an integer number (6155905).

Almost surely, 2^12311809 is an apocalyptic number.

It is an amenable number.

12311809 is a deficient number, since it is larger than the sum of its proper divisors (1).

12311809 is an equidigital number, since it uses as much as digits as its factorization.

12311809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 12311809 is about 3508.8187470999. The cubic root of 12311809 is about 230.9088738098.

It can be divided in two parts, 12311 and 809, that multiplied together give a palindrome (9959599).

The spelling of 12311809 in words is "twelve million, three hundred eleven thousand, eight hundred nine".