243845419 has 2 divisors, whose sum is σ = 243845420. Its totient is φ = 243845418.

The previous prime is 243845417. The next prime is 243845423. The reversal of 243845419 is 914548342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243845419 - 2¹ = 243845417 is a prime.

It is a super-2 number, since 2×243845419² = 118921176734571122, which contains 22 as substring.

Together with 243845417, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (243845417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121922709 + 121922710.

It is an arithmetic number, because the mean of its divisors is an integer number (121922710).

Almost surely, 2^243845419 is an apocalyptic number.

243845419 is a deficient number, since it is larger than the sum of its proper divisors (1).

243845419 is an equidigital number, since it uses as much as digits as its factorization.

243845419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 40.

The square root of 243845419 is about 15615.5505506530. The cubic root of 243845419 is about 624.7479892786.

It can be divided in two parts, 24384 and 5419, that multiplied together give a triangular number (132136896 = T₁₆₂₅₆).

The spelling of 243845419 in words is "two hundred forty-three million, eight hundred forty-five thousand, four hundred nineteen".