243855371 has 2 divisors, whose sum is σ = 243855372. Its totient is φ = 243855370.

The previous prime is 243855349. The next prime is 243855373. The reversal of 243855371 is 173558342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243855371 - 2¹⁸ = 243593227 is a prime.

Together with 243855373, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243855373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121927685 + 121927686.

It is an arithmetic number, because the mean of its divisors is an integer number (121927686).

Almost surely, 2^243855371 is an apocalyptic number.

243855371 is a deficient number, since it is larger than the sum of its proper divisors (1).

243855371 is an equidigital number, since it uses as much as digits as its factorization.

243855371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 38.

The square root of 243855371 is about 15615.8692041141. The cubic root of 243855371 is about 624.7564883890.

The spelling of 243855371 in words is "two hundred forty-three million, eight hundred fifty-five thousand, three hundred seventy-one".