243636121607 has 2 divisors, whose sum is σ = 243636121608. Its totient is φ = 243636121606.

The previous prime is 243636121601. The next prime is 243636121709. The reversal of 243636121607 is 706121636342.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243636121607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243636121601) 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, 121818060803 + 121818060804.

It is an arithmetic number, because the mean of its divisors is an integer number (121818060804).

Almost surely, 2^243636121607 is an apocalyptic number.

243636121607 is a deficient number, since it is larger than the sum of its proper divisors (1).

243636121607 is an equidigital number, since it uses as much as digits as its factorization.

243636121607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 41.

Adding to 243636121607 its reverse (706121636342), we get a palindrome (949757757949).

The spelling of 243636121607 in words is "two hundred forty-three billion, six hundred thirty-six million, one hundred twenty-one thousand, six hundred seven".