243122049991 has 2 divisors, whose sum is σ = 243122049992. Its totient is φ = 243122049990.

The previous prime is 243122049979. The next prime is 243122050001. The reversal of 243122049991 is 199940221342.

243122049991 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 not a de Polignac number, because 243122049991 - 2³⁵ = 208762311623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243122049791) 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, 121561024995 + 121561024996.

It is an arithmetic number, because the mean of its divisors is an integer number (121561024996).

Almost surely, 2^243122049991 is an apocalyptic number.

243122049991 is a deficient number, since it is larger than the sum of its proper divisors (1).

243122049991 is an equidigital number, since it uses as much as digits as its factorization.

243122049991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 243122049991 in words is "two hundred forty-three billion, one hundred twenty-two million, forty-nine thousand, nine hundred ninety-one".