243423431 has 2 divisors, whose sum is σ = 243423432. Its totient is φ = 243423430.

The previous prime is 243423413. The next prime is 243423449. The reversal of 243423431 is 134324342.

Together with previous prime (243423413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (243423413) and next prime (243423449).

It is a cyclic number.

It is not a de Polignac number, because 243423431 - 2¹⁸ = 243161287 is a prime.

It is a super-2 number, since 2×243423431² = 118509933519623522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 243423431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243423451) 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 as a sum of consecutive naturals, namely, 121711715 + 121711716.

It is an arithmetic number, because the mean of its divisors is an integer number (121711716).

Almost surely, 2^243423431 is an apocalyptic number.

243423431 is a deficient number, since it is larger than the sum of its proper divisors (1).

243423431 is an equidigital number, since it uses as much as digits as its factorization.

243423431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 26.

The square root of 243423431 is about 15602.0329124124. The cubic root of 243423431 is about 624.3873941921.

Adding to 243423431 its reverse (134324342), we get a palindrome (377747773).

The spelling of 243423431 in words is "two hundred forty-three million, four hundred twenty-three thousand, four hundred thirty-one".