243145021139 has 2 divisors, whose sum is σ = 243145021140. Its totient is φ = 243145021138.

The previous prime is 243145021099. The next prime is 243145021159. The reversal of 243145021139 is 931120541342.

It is a happy number.

243145021139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243145021139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243145021099 and 243145021108.

It is not a weakly prime, because it can be changed into another prime (243145021159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121572510569 + 121572510570.

It is an arithmetic number, because the mean of its divisors is an integer number (121572510570).

Almost surely, 2^243145021139 is an apocalyptic number.

243145021139 is a deficient number, since it is larger than the sum of its proper divisors (1).

243145021139 is an equidigital number, since it uses as much as digits as its factorization.

243145021139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 243145021139 in words is "two hundred forty-three billion, one hundred forty-five million, twenty-one thousand, one hundred thirty-nine".