243617393 has 2 divisors, whose sum is σ = 243617394. Its totient is φ = 243617392.

The previous prime is 243617333. The next prime is 243617399. The reversal of 243617393 is 393716342.

243617393 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 can be written as a sum of positive squares in only one way, i.e., 184742464 + 58874929 = 13592^2 + 7673^2 .

It is a cyclic number.

It is not a de Polignac number, because 243617393 - 2⁶ = 243617329 is a prime.

It is not a weakly prime, because it can be changed into another prime (243617399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121808696 + 121808697.

It is an arithmetic number, because the mean of its divisors is an integer number (121808697).

Almost surely, 2^243617393 is an apocalyptic number.

It is an amenable number.

243617393 is a deficient number, since it is larger than the sum of its proper divisors (1).

243617393 is an equidigital number, since it uses as much as digits as its factorization.

243617393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 38.

The square root of 243617393 is about 15608.2475954221. The cubic root of 243617393 is about 624.5531893458.

The spelling of 243617393 in words is "two hundred forty-three million, six hundred seventeen thousand, three hundred ninety-three".