243513021005 has 16 divisors (see below), whose sum is σ = 292834681920. Its totient is φ = 194397963648.

The previous prime is 243513020981. The next prime is 243513021047. The reversal of 243513021005 is 500120315342.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 243513021005 - 2⁶ = 243513020941 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 8757254 + ... + 8785016.

It is an arithmetic number, because the mean of its divisors is an integer number (18302167620).

Almost surely, 2^243513021005 is an apocalyptic number.

It is an amenable number.

243513021005 is a deficient number, since it is larger than the sum of its proper divisors (49321660915).

243513021005 is a wasteful number, since it uses less digits than its factorization.

243513021005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31420.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 243513021005 its reverse (500120315342), we get a palindrome (743633336347).

The spelling of 243513021005 in words is "two hundred forty-three billion, five hundred thirteen million, twenty-one thousand, five".