12451989791 has 4 divisors (see below), whose sum is σ = 12716925792. Its totient is φ = 12187053792.

The previous prime is 12451989773. The next prime is 12451989799. The reversal of 12451989791 is 19798915421.

It is a happy number.

12451989791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19798915421 = 31 ⋅638674691.

It is a cyclic number.

It is not a de Polignac number, because 12451989791 - 2¹⁸ = 12451727647 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 (12451989799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132467930 + ... + 132468023.

It is an arithmetic number, because the mean of its divisors is an integer number (3179231448).

Almost surely, 2^12451989791 is an apocalyptic number.

12451989791 is a deficient number, since it is larger than the sum of its proper divisors (264936001).

12451989791 is an equidigital number, since it uses as much as digits as its factorization.

12451989791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264936000.

The product of its digits is 1632960, while the sum is 56.

The spelling of 12451989791 in words is "twelve billion, four hundred fifty-one million, nine hundred eighty-nine thousand, seven hundred ninety-one".