243120535231 has 4 divisors (see below), whose sum is σ = 277852040272. Its totient is φ = 208389030192.

The previous prime is 243120535211. The next prime is 243120535247. The reversal of 243120535231 is 132535021342.

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

It is not a de Polignac number, because 243120535231 - 2⁹ = 243120534719 is a prime.

It is a super-2 number, since 2×243120535231² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243120535193 and 243120535202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243120535211) 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, 17365752510 + ... + 17365752523.

It is an arithmetic number, because the mean of its divisors is an integer number (69463010068).

Almost surely, 2^243120535231 is an apocalyptic number.

243120535231 is a deficient number, since it is larger than the sum of its proper divisors (34731505041).

243120535231 is an equidigital number, since it uses as much as digits as its factorization.

243120535231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34731505040.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 243120535231 its reverse (132535021342), we get a palindrome (375655556573).

The spelling of 243120535231 in words is "two hundred forty-three billion, one hundred twenty million, five hundred thirty-five thousand, two hundred thirty-one".