12311999 has 4 divisors (see below), whose sum is σ = 14070864. Its totient is φ = 10553136.

The previous prime is 12311989. The next prime is 12312011. The reversal of 12311999 is 99911321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12311999 - 2⁴ = 12311983 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 (12311939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879422 + ... + 879435.

It is an arithmetic number, because the mean of its divisors is an integer number (3517716).

Almost surely, 2^12311999 is an apocalyptic number.

12311999 is a deficient number, since it is larger than the sum of its proper divisors (1758865).

12311999 is an equidigital number, since it uses as much as digits as its factorization.

12311999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758864.

The product of its digits is 4374, while the sum is 35.

The square root of 12311999 is about 3508.8458216342. The cubic root of 12311999 is about 230.9100616250.

The spelling of 12311999 in words is "twelve million, three hundred eleven thousand, nine hundred ninety-nine".