243401593 has 2 divisors, whose sum is σ = 243401594. Its totient is φ = 243401592.

The previous prime is 243401591. The next prime is 243401603. The reversal of 243401593 is 395104342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232623504 + 10778089 = 15252^2 + 3283^2 .

It is a cyclic number.

It is not a de Polignac number, because 243401593 - 2¹ = 243401591 is a prime.

Together with 243401591, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (243401591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121700796 + 121700797.

It is an arithmetic number, because the mean of its divisors is an integer number (121700797).

Almost surely, 2^243401593 is an apocalyptic number.

It is an amenable number.

243401593 is a deficient number, since it is larger than the sum of its proper divisors (1).

243401593 is an equidigital number, since it uses as much as digits as its factorization.

243401593 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 243401593 is about 15601.3330520183. Note that the first 3 decimals coincide. The cubic root of 243401593 is about 624.3687219555.

The spelling of 243401593 in words is "two hundred forty-three million, four hundred one thousand, five hundred ninety-three".