243243133129 has 2 divisors, whose sum is σ = 243243133130. Its totient is φ = 243243133128.

The previous prime is 243243133109. The next prime is 243243133139. The reversal of 243243133129 is 921331342342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236441007504 + 6802125625 = 486252^2 + 82475^2 .

It is a cyclic number.

It is not a de Polignac number, because 243243133129 - 2¹¹ = 243243131081 is a prime.

It is not a weakly prime, because it can be changed into another prime (243243133109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121621566564 + 121621566565.

It is an arithmetic number, because the mean of its divisors is an integer number (121621566565).

Almost surely, 2^243243133129 is an apocalyptic number.

It is an amenable number.

243243133129 is a deficient number, since it is larger than the sum of its proper divisors (1).

243243133129 is an equidigital number, since it uses as much as digits as its factorization.

243243133129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 37.

The spelling of 243243133129 in words is "two hundred forty-three billion, two hundred forty-three million, one hundred thirty-three thousand, one hundred twenty-nine".