243303139 has 2 divisors, whose sum is σ = 243303140. Its totient is φ = 243303138.

The previous prime is 243303119. The next prime is 243303149. The reversal of 243303139 is 931303342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243303139 - 2⁹ = 243302627 is a prime.

It is not a weakly prime, because it can be changed into another prime (243303119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121651569 + 121651570.

It is an arithmetic number, because the mean of its divisors is an integer number (121651570).

Almost surely, 2^243303139 is an apocalyptic number.

243303139 is a deficient number, since it is larger than the sum of its proper divisors (1).

243303139 is an equidigital number, since it uses as much as digits as its factorization.

243303139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 28.

The square root of 243303139 is about 15598.1774255841. The cubic root of 243303139 is about 624.2845265489.

The spelling of 243303139 in words is "two hundred forty-three million, three hundred three thousand, one hundred thirty-nine".