12311516999 has 4 divisors (see below), whose sum is σ = 12343662336. Its totient is φ = 12279371664.

The previous prime is 12311516989. The next prime is 12311517013. The reversal of 12311516999 is 99961511321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99961511321 = 7 ⋅14280215903.

It is a cyclic number.

It is not a de Polignac number, because 12311516999 - 2⁸ = 12311516743 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 (12311516989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16072094 + ... + 16072859.

It is an arithmetic number, because the mean of its divisors is an integer number (3085915584).

Almost surely, 2^12311516999 is an apocalyptic number.

12311516999 is a deficient number, since it is larger than the sum of its proper divisors (32145337).

12311516999 is an equidigital number, since it uses as much as digits as its factorization.

12311516999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32145336.

The product of its digits is 131220, while the sum is 47.

The spelling of 12311516999 in words is "twelve billion, three hundred eleven million, five hundred sixteen thousand, nine hundred ninety-nine".