243342493 has 2 divisors, whose sum is σ = 243342494. Its totient is φ = 243342492.

The previous prime is 243342487. The next prime is 243342521. The reversal of 243342493 is 394243342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 241709209 + 1633284 = 15547^2 + 1278^2 .

It is a cyclic number.

It is not a de Polignac number, because 243342493 - 2⁹ = 243341981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243342433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121671246 + 121671247.

It is an arithmetic number, because the mean of its divisors is an integer number (121671247).

Almost surely, 2^243342493 is an apocalyptic number.

It is an amenable number.

243342493 is a deficient number, since it is larger than the sum of its proper divisors (1).

243342493 is an equidigital number, since it uses as much as digits as its factorization.

243342493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 34.

The square root of 243342493 is about 15599.4388681132. The cubic root of 243342493 is about 624.3181838332.

The spelling of 243342493 in words is "two hundred forty-three million, three hundred forty-two thousand, four hundred ninety-three".