243948673 has 2 divisors, whose sum is σ = 243948674. Its totient is φ = 243948672.

The previous prime is 243948671. The next prime is 243948689. The reversal of 243948673 is 376849342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185150449 + 58798224 = 13607^2 + 7668^2 .

It is a cyclic number.

It is not a de Polignac number, because 243948673 - 2¹ = 243948671 is a prime.

Together with 243948671, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (243948671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121974336 + 121974337.

It is an arithmetic number, because the mean of its divisors is an integer number (121974337).

Almost surely, 2^243948673 is an apocalyptic number.

It is an amenable number.

243948673 is a deficient number, since it is larger than the sum of its proper divisors (1).

243948673 is an equidigital number, since it uses as much as digits as its factorization.

243948673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 46.

The square root of 243948673 is about 15618.8563281695. The cubic root of 243948673 is about 624.8361580130.

The spelling of 243948673 in words is "two hundred forty-three million, nine hundred forty-eight thousand, six hundred seventy-three".