12321791 has 4 divisors (see below), whose sum is σ = 12366552. Its totient is φ = 12277032.

The previous prime is 12321763. The next prime is 12321797. The reversal of 12321791 is 19712321.

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-12321791 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12321791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321797) 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, 21965 + ... + 22518.

It is an arithmetic number, because the mean of its divisors is an integer number (3091638).

Almost surely, 2^12321791 is an apocalyptic number.

12321791 is a deficient number, since it is larger than the sum of its proper divisors (44761).

12321791 is an equidigital number, since it uses as much as digits as its factorization.

12321791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44760.

The product of its digits is 756, while the sum is 26.

The square root of 12321791 is about 3510.2408749258. The cubic root of 12321791 is about 230.9712613311.

The spelling of 12321791 in words is "twelve million, three hundred twenty-one thousand, seven hundred ninety-one".