243855373 has 2 divisors, whose sum is σ = 243855374. Its totient is φ = 243855372.

The previous prime is 243855371. The next prime is 243855377. The reversal of 243855373 is 373558342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202407529 + 41447844 = 14227^2 + 6438^2 .

It is a cyclic number.

It is not a de Polignac number, because 243855373 - 2¹ = 243855371 is a prime.

Together with 243855371, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243855371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121927686 + 121927687.

It is an arithmetic number, because the mean of its divisors is an integer number (121927687).

Almost surely, 2^243855373 is an apocalyptic number.

It is an amenable number.

243855373 is a deficient number, since it is larger than the sum of its proper divisors (1).

243855373 is an equidigital number, since it uses as much as digits as its factorization.

243855373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 40.

The square root of 243855373 is about 15615.8692681515. The cubic root of 243855373 is about 624.7564900970.

The spelling of 243855373 in words is "two hundred forty-three million, eight hundred fifty-five thousand, three hundred seventy-three".