243206843437 has 2 divisors, whose sum is σ = 243206843438. Its totient is φ = 243206843436.

The previous prime is 243206843357. The next prime is 243206843441. The reversal of 243206843437 is 734348602342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167232741481 + 75974101956 = 408941^2 + 275634^2 .

It is a cyclic number.

It is not a de Polignac number, because 243206843437 - 2¹⁵ = 243206810669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243276843437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121603421718 + 121603421719.

It is an arithmetic number, because the mean of its divisors is an integer number (121603421719).

Almost surely, 2^243206843437 is an apocalyptic number.

It is an amenable number.

243206843437 is a deficient number, since it is larger than the sum of its proper divisors (1).

243206843437 is an equidigital number, since it uses as much as digits as its factorization.

243206843437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2322432, while the sum is 46.

The spelling of 243206843437 in words is "two hundred forty-three billion, two hundred six million, eight hundred forty-three thousand, four hundred thirty-seven".