243131442123 has 4 divisors (see below), whose sum is σ = 324175256168. Its totient is φ = 162087628080.

The previous prime is 243131442121. The next prime is 243131442131. The reversal of 243131442123 is 321244131342.

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

It is not a de Polignac number, because 243131442123 - 2¹ = 243131442121 is a prime.

It is a super-2 number, since 2×243131442123² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243131442121) 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, 40521907018 + ... + 40521907023.

It is an arithmetic number, because the mean of its divisors is an integer number (81043814042).

Almost surely, 2^243131442123 is an apocalyptic number.

243131442123 is a deficient number, since it is larger than the sum of its proper divisors (81043814045).

243131442123 is an equidigital number, since it uses as much as digits as its factorization.

243131442123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81043814044.

The product of its digits is 13824, while the sum is 30.

Adding to 243131442123 its reverse (321244131342), we get a palindrome (564375573465).

The spelling of 243131442123 in words is "two hundred forty-three billion, one hundred thirty-one million, four hundred forty-two thousand, one hundred twenty-three".