243256123133 has 4 divisors (see below), whose sum is σ = 251644265340. Its totient is φ = 234867980928.

The previous prime is 243256123127. The next prime is 243256123141. The reversal of 243256123133 is 331321652342.

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

It can be written as a sum of positive squares in 2 ways, for example, as 40754323129 + 202501800004 = 201877^2 + 450002^2 .

It is a cyclic number.

It is not a de Polignac number, because 243256123133 - 2¹⁴ = 243256106749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243256123093 and 243256123102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243256123193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4194071060 + ... + 4194071117.

It is an arithmetic number, because the mean of its divisors is an integer number (62911066335).

Almost surely, 2^243256123133 is an apocalyptic number.

It is an amenable number.

243256123133 is a deficient number, since it is larger than the sum of its proper divisors (8388142207).

243256123133 is an equidigital number, since it uses as much as digits as its factorization.

243256123133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8388142206.

The product of its digits is 77760, while the sum is 35.

Adding to 243256123133 its reverse (331321652342), we get a palindrome (574577775475).

The spelling of 243256123133 in words is "two hundred forty-three billion, two hundred fifty-six million, one hundred twenty-three thousand, one hundred thirty-three".