12231309991 has 4 divisors (see below), whose sum is σ = 12950798832. Its totient is φ = 11511821152.

The previous prime is 12231309947. The next prime is 12231310009. The reversal of 12231309991 is 19990313221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19990313221 = 109 ⋅183397369.

It is a cyclic number.

It is not a de Polignac number, because 12231309991 - 2¹¹ = 12231307943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12231306991) 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, 359744395 + ... + 359744428.

It is an arithmetic number, because the mean of its divisors is an integer number (3237699708).

Almost surely, 2^12231309991 is an apocalyptic number.

12231309991 is a deficient number, since it is larger than the sum of its proper divisors (719488841).

12231309991 is an equidigital number, since it uses as much as digits as its factorization.

12231309991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719488840.

The product of its (nonzero) digits is 26244, while the sum is 40.

The spelling of 12231309991 in words is "twelve billion, two hundred thirty-one million, three hundred nine thousand, nine hundred ninety-one".