243081539 has 2 divisors, whose sum is σ = 243081540. Its totient is φ = 243081538.

The previous prime is 243081511. The next prime is 243081547. The reversal of 243081539 is 935180342.

243081539 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243081539 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 243081499 and 243081508.

It is not a weakly prime, because it can be changed into another prime (243081569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121540769 + 121540770.

It is an arithmetic number, because the mean of its divisors is an integer number (121540770).

Almost surely, 2^243081539 is an apocalyptic number.

243081539 is a deficient number, since it is larger than the sum of its proper divisors (1).

243081539 is an equidigital number, since it uses as much as digits as its factorization.

243081539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 243081539 is about 15591.0724134038. The cubic root of 243081539 is about 624.0949366224.

The spelling of 243081539 in words is "two hundred forty-three million, eighty-one thousand, five hundred thirty-nine".