243423503 has 2 divisors, whose sum is σ = 243423504. Its totient is φ = 243423502.

The previous prime is 243423451. The next prime is 243423547. The reversal of 243423503 is 305324342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243423503 - 2¹⁰ = 243422479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243425503) 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, 121711751 + 121711752.

It is an arithmetic number, because the mean of its divisors is an integer number (121711752).

Almost surely, 2^243423503 is an apocalyptic number.

243423503 is a deficient number, since it is larger than the sum of its proper divisors (1).

243423503 is an equidigital number, since it uses as much as digits as its factorization.

243423503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 26.

The square root of 243423503 is about 15602.0352198039. The cubic root of 243423503 is about 624.3874557527.

Adding to 243423503 its reverse (305324342), we get a palindrome (548747845).

The spelling of 243423503 in words is "two hundred forty-three million, four hundred twenty-three thousand, five hundred three".