243203400031 has 24 divisors (see below), whose sum is σ = 269094126080. Its totient is φ = 219137044896.

The previous prime is 243203400007. The next prime is 243203400043. The reversal of 243203400031 is 130004302342.

It is a happy number.

It is not a de Polignac number, because 243203400031 - 2¹⁹ = 243202875743 is a prime.

It is a super-2 number, since 2×243203400031² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243203399975 and 243203400011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243203400061) 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 23 ways as a sum of consecutive naturals, for example, 957010 + ... + 1184176.

Almost surely, 2^243203400031 is an apocalyptic number.

243203400031 is a deficient number, since it is larger than the sum of its proper divisors (25890726049).

243203400031 is a wasteful number, since it uses less digits than its factorization.

243203400031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227311 (or 227282 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 243203400031 its reverse (130004302342), we get a palindrome (373207702373).

The spelling of 243203400031 in words is "two hundred forty-three billion, two hundred three million, four hundred thousand, thirty-one".