123170720843 has 4 divisors (see below), whose sum is σ = 126174884808. Its totient is φ = 120166556880.

The previous prime is 123170720819. The next prime is 123170720921. The reversal of 123170720843 is 348027071321.

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 123170720843 - 2⁶ = 123170720779 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123170720797 and 123170720806.

It is not an unprimeable number, because it can be changed into a prime (123170770843) 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, 1502081921 + ... + 1502082002.

It is an arithmetic number, because the mean of its divisors is an integer number (31543721202).

Almost surely, 2^123170720843 is an apocalyptic number.

123170720843 is a deficient number, since it is larger than the sum of its proper divisors (3004163965).

123170720843 is an equidigital number, since it uses as much as digits as its factorization.

123170720843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3004163964.

The product of its (nonzero) digits is 56448, while the sum is 38.

The spelling of 123170720843 in words is "one hundred twenty-three billion, one hundred seventy million, seven hundred twenty thousand, eight hundred forty-three".