243203241389 has 2 divisors, whose sum is σ = 243203241390. Its totient is φ = 243203241388.

The previous prime is 243203241371. The next prime is 243203241433. The reversal of 243203241389 is 983142302342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171016985764 + 72186255625 = 413542^2 + 268675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243203241389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243203241089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121601620694 + 121601620695.

It is an arithmetic number, because the mean of its divisors is an integer number (121601620695).

Almost surely, 2^243203241389 is an apocalyptic number.

It is an amenable number.

243203241389 is a deficient number, since it is larger than the sum of its proper divisors (1).

243203241389 is an equidigital number, since it uses as much as digits as its factorization.

243203241389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 41.

The spelling of 243203241389 in words is "two hundred forty-three billion, two hundred three million, two hundred forty-one thousand, three hundred eighty-nine".