243204111031 has 4 divisors (see below), whose sum is σ = 277947555472. Its totient is φ = 208460666592.

The previous prime is 243204111013. The next prime is 243204111041. The reversal of 243204111031 is 130111402342.

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 243204111031 - 2⁵ = 243204110999 is a prime.

It is a super-2 number, since 2×243204111031² (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 = 243204110993 and 243204111011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243204111001) 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, 17371722210 + ... + 17371722223.

It is an arithmetic number, because the mean of its divisors is an integer number (69486888868).

Almost surely, 2^243204111031 is an apocalyptic number.

243204111031 is a deficient number, since it is larger than the sum of its proper divisors (34743444441).

243204111031 is an equidigital number, since it uses as much as digits as its factorization.

243204111031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34743444440.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 243204111031 its reverse (130111402342), we get a palindrome (373315513373).

The spelling of 243204111031 in words is "two hundred forty-three billion, two hundred four million, one hundred eleven thousand, thirty-one".