243396533 has 2 divisors, whose sum is σ = 243396534. Its totient is φ = 243396532.

The previous prime is 243396523. The next prime is 243396539. The reversal of 243396533 is 335693342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223263364 + 20133169 = 14942^2 + 4487^2 .

It is a cyclic number.

It is not a de Polignac number, because 243396533 - 2¹⁴ = 243380149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243396539) 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, 121698266 + 121698267.

It is an arithmetic number, because the mean of its divisors is an integer number (121698267).

Almost surely, 2^243396533 is an apocalyptic number.

It is an amenable number.

243396533 is a deficient number, since it is larger than the sum of its proper divisors (1).

243396533 is an equidigital number, since it uses as much as digits as its factorization.

243396533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 38.

The square root of 243396533 is about 15601.1708855457. The cubic root of 243396533 is about 624.3643953232.

The spelling of 243396533 in words is "two hundred forty-three million, three hundred ninety-six thousand, five hundred thirty-three".