243044019893 has 2 divisors, whose sum is σ = 243044019894. Its totient is φ = 243044019892.

The previous prime is 243044019871. The next prime is 243044019913. The reversal of 243044019893 is 398910440342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222158567569 + 20885452324 = 471337^2 + 144518^2 .

It is a cyclic number.

It is not a de Polignac number, because 243044019893 - 2²⁰ = 243042971317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243044019193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121522009946 + 121522009947.

It is an arithmetic number, because the mean of its divisors is an integer number (121522009947).

Almost surely, 2^243044019893 is an apocalyptic number.

It is an amenable number.

243044019893 is a deficient number, since it is larger than the sum of its proper divisors (1).

243044019893 is an equidigital number, since it uses as much as digits as its factorization.

243044019893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 47.

The spelling of 243044019893 in words is "two hundred forty-three billion, forty-four million, nineteen thousand, eight hundred ninety-three".