243013243549 has 2 divisors, whose sum is σ = 243013243550. Its totient is φ = 243013243548.

The previous prime is 243013243489. The next prime is 243013243573. The reversal of 243013243549 is 945342310342.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208398641049 + 34614602500 = 456507^2 + 186050^2 .

It is a cyclic number.

It is not a de Polignac number, because 243013243549 - 2¹¹ = 243013241501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243013240549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121506621774 + 121506621775.

It is an arithmetic number, because the mean of its divisors is an integer number (121506621775).

Almost surely, 2^243013243549 is an apocalyptic number.

It is an amenable number.

243013243549 is a deficient number, since it is larger than the sum of its proper divisors (1).

243013243549 is an equidigital number, since it uses as much as digits as its factorization.

243013243549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 40.

The spelling of 243013243549 in words is "two hundred forty-three billion, thirteen million, two hundred forty-three thousand, five hundred forty-nine".