123140404243 has 4 divisors (see below), whose sum is σ = 123365524360. Its totient is φ = 122915284128.

The previous prime is 123140404229. The next prime is 123140404291. The reversal of 123140404243 is 342404041321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342404041321 = 41 ⋅8351318081.

It is a cyclic number.

It is not a de Polignac number, because 123140404243 - 2¹³ = 123140396051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123140404643) 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, 112559238 + ... + 112560331.

It is an arithmetic number, because the mean of its divisors is an integer number (30841381090).

Almost surely, 2^123140404243 is an apocalyptic number.

123140404243 is a deficient number, since it is larger than the sum of its proper divisors (225120117).

123140404243 is an equidigital number, since it uses as much as digits as its factorization.

123140404243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225120116.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 123140404243 its reverse (342404041321), we get a palindrome (465544445564).

The spelling of 123140404243 in words is "one hundred twenty-three billion, one hundred forty million, four hundred four thousand, two hundred forty-three".