243102020209 has 2 divisors, whose sum is σ = 243102020210. Its totient is φ = 243102020208.

The previous prime is 243102020141. The next prime is 243102020233. The reversal of 243102020209 is 902020201342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121787040400 + 121314979809 = 348980^2 + 348303^2 .

It is a cyclic number.

It is not a de Polignac number, because 243102020209 - 2¹⁹ = 243101495921 is a prime.

It is not a weakly prime, because it can be changed into another prime (243102020299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121551010104 + 121551010105.

It is an arithmetic number, because the mean of its divisors is an integer number (121551010105).

Almost surely, 2^243102020209 is an apocalyptic number.

It is an amenable number.

243102020209 is a deficient number, since it is larger than the sum of its proper divisors (1).

243102020209 is an equidigital number, since it uses as much as digits as its factorization.

243102020209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The spelling of 243102020209 in words is "two hundred forty-three billion, one hundred two million, twenty thousand, two hundred nine".