243504350989 has 2 divisors, whose sum is σ = 243504350990. Its totient is φ = 243504350988.

The previous prime is 243504350983. The next prime is 243504351029. The reversal of 243504350989 is 989053405342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243500797764 + 3553225 = 493458^2 + 1885^2 .

It is a cyclic number.

It is not a de Polignac number, because 243504350989 - 2⁷ = 243504350861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243504350983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121752175494 + 121752175495.

It is an arithmetic number, because the mean of its divisors is an integer number (121752175495).

Almost surely, 2^243504350989 is an apocalyptic number.

It is an amenable number.

243504350989 is a deficient number, since it is larger than the sum of its proper divisors (1).

243504350989 is an equidigital number, since it uses as much as digits as its factorization.

243504350989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4665600, while the sum is 52.

The spelling of 243504350989 in words is "two hundred forty-three billion, five hundred four million, three hundred fifty thousand, nine hundred eighty-nine".