12318311 has 4 divisors (see below), whose sum is σ = 12328272. Its totient is φ = 12308352.

The previous prime is 12318283. The next prime is 12318329. The reversal of 12318311 is 11381321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 11381321 = 7 ⋅1625903.

It is a cyclic number.

It is not a de Polignac number, because 12318311 - 2⁶ = 12318247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12311311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2810 + ... + 5703.

It is an arithmetic number, because the mean of its divisors is an integer number (3082068).

Almost surely, 2^12318311 is an apocalyptic number.

12318311 is a deficient number, since it is larger than the sum of its proper divisors (9961).

12318311 is an equidigital number, since it uses as much as digits as its factorization.

12318311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9960.

The product of its digits is 144, while the sum is 20.

The square root of 12318311 is about 3509.7451474430. The cubic root of 12318311 is about 230.9495151507.

Adding to 12318311 its reverse (11381321), we get a palindrome (23699632).

The spelling of 12318311 in words is "twelve million, three hundred eighteen thousand, three hundred eleven".