243940603 has 2 divisors, whose sum is σ = 243940604. Its totient is φ = 243940602.

The previous prime is 243940597. The next prime is 243940637. The reversal of 243940603 is 306049342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243940603 - 2²¹ = 241843451 is a prime.

It is not a weakly prime, because it can be changed into another prime (243940673) 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 as a sum of consecutive naturals, namely, 121970301 + 121970302.

It is an arithmetic number, because the mean of its divisors is an integer number (121970302).

Almost surely, 2^243940603 is an apocalyptic number.

243940603 is a deficient number, since it is larger than the sum of its proper divisors (1).

243940603 is an equidigital number, since it uses as much as digits as its factorization.

243940603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 243940603 is about 15618.5979844543. The cubic root of 243940603 is about 624.8292679251.

Adding to 243940603 its reverse (306049342), we get a palindrome (549989945).

The spelling of 243940603 in words is "two hundred forty-three million, nine hundred forty thousand, six hundred three".