12312965891 has 4 divisors (see below), whose sum is σ = 12362021784. Its totient is φ = 12263910000.

The previous prime is 12312965869. The next prime is 12312965893. The reversal of 12312965891 is 19856921321.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12312965891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12312965893) 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, 24527570 + ... + 24528071.

It is an arithmetic number, because the mean of its divisors is an integer number (3090505446).

Almost surely, 2^12312965891 is an apocalyptic number.

12312965891 is a deficient number, since it is larger than the sum of its proper divisors (49055893).

12312965891 is an equidigital number, since it uses as much as digits as its factorization.

12312965891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49055892.

The product of its digits is 233280, while the sum is 47.

The spelling of 12312965891 in words is "twelve billion, three hundred twelve million, nine hundred sixty-five thousand, eight hundred ninety-one".