243404231 has 16 divisors (see below), whose sum is σ = 296121600. Its totient is φ = 195421248.

The previous prime is 243404207. The next prime is 243404251. The reversal of 243404231 is 132404342.

It is a cyclic number.

It is not a de Polignac number, because 243404231 - 2¹⁰ = 243403207 is a prime.

It is a super-2 number, since 2×243404231² = 118491239337402722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243404197 and 243404206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243404251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1556 + ... + 22118.

It is an arithmetic number, because the mean of its divisors is an integer number (18507600).

Almost surely, 2^243404231 is an apocalyptic number.

243404231 is a deficient number, since it is larger than the sum of its proper divisors (52717369).

243404231 is a wasteful number, since it uses less digits than its factorization.

243404231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20678.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 243404231 is about 15601.4175958469. The cubic root of 243404231 is about 624.3709775950.

Adding to 243404231 its reverse (132404342), we get a palindrome (375808573).

The spelling of 243404231 in words is "two hundred forty-three million, four hundred four thousand, two hundred thirty-one".