123251205342443 has 4 divisors (see below), whose sum is σ = 123261023821128. Its totient is φ = 123241386863760.

The previous prime is 123251205342407. The next prime is 123251205342511. The reversal of 123251205342443 is 344243502152321.

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

It is a cyclic number.

It is not a de Polignac number, because 123251205342443 - 2¹⁸ = 123251205080299 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 123251205342443.

It is not an unprimeable number, because it can be changed into a prime (123251205342043) 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, 4909220513 + ... + 4909245618.

It is an arithmetic number, because the mean of its divisors is an integer number (30815255955282).

Almost surely, 2^{123251205342443} is an apocalyptic number.

123251205342443 is a deficient number, since it is larger than the sum of its proper divisors (9818478685).

123251205342443 is an equidigital number, since it uses as much as digits as its factorization.

123251205342443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9818478684.

The product of its (nonzero) digits is 691200, while the sum is 41.

Adding to 123251205342443 its reverse (344243502152321), we get a palindrome (467494707494764).

The spelling of 123251205342443 in words is "one hundred twenty-three trillion, two hundred fifty-one billion, two hundred five million, three hundred forty-two thousand, four hundred forty-three".