243023563501 has 2 divisors, whose sum is σ = 243023563502. Its totient is φ = 243023563500.

The previous prime is 243023563483. The next prime is 243023563513. The reversal of 243023563501 is 105365320342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 242754275401 + 269288100 = 492701^2 + 16410^2 .

It is a cyclic number.

It is not a de Polignac number, because 243023563501 - 2⁵ = 243023563469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243023563571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121511781750 + 121511781751.

It is an arithmetic number, because the mean of its divisors is an integer number (121511781751).

Almost surely, 2^243023563501 is an apocalyptic number.

It is an amenable number.

243023563501 is a deficient number, since it is larger than the sum of its proper divisors (1).

243023563501 is an equidigital number, since it uses as much as digits as its factorization.

243023563501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 34.

Adding to 243023563501 its reverse (105365320342), we get a palindrome (348388883843).

The spelling of 243023563501 in words is "two hundred forty-three billion, twenty-three million, five hundred sixty-three thousand, five hundred one".