243103313 has 2 divisors, whose sum is σ = 243103314. Its totient is φ = 243103312.

The previous prime is 243103277. The next prime is 243103321. The reversal of 243103313 is 313301342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157577809 + 85525504 = 12553^2 + 9248^2 .

It is a cyclic number.

It is not a de Polignac number, because 243103313 - 2⁸ = 243103057 is a prime.

It is not a weakly prime, because it can be changed into another prime (243103373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121551656 + 121551657.

It is an arithmetic number, because the mean of its divisors is an integer number (121551657).

Almost surely, 2^243103313 is an apocalyptic number.

It is an amenable number.

243103313 is a deficient number, since it is larger than the sum of its proper divisors (1).

243103313 is an equidigital number, since it uses as much as digits as its factorization.

243103313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 243103313 is about 15591.7706819976. The cubic root of 243103313 is about 624.1135704760.

Adding to 243103313 its reverse (313301342), we get a palindrome (556404655).

The spelling of 243103313 in words is "two hundred forty-three million, one hundred three thousand, three hundred thirteen".