243874919 has 2 divisors, whose sum is σ = 243874920. Its totient is φ = 243874918.

The previous prime is 243874913. The next prime is 243874921. The reversal of 243874919 is 919478342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243874919 - 2⁸ = 243874663 is a prime.

It is a super-2 number, since 2×243874919² = 118949952234513122, which contains 22 as substring.

Together with 243874921, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243874913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121937459 + 121937460.

It is an arithmetic number, because the mean of its divisors is an integer number (121937460).

Almost surely, 2^243874919 is an apocalyptic number.

243874919 is a deficient number, since it is larger than the sum of its proper divisors (1).

243874919 is an equidigital number, since it uses as much as digits as its factorization.

243874919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 47.

The square root of 243874919 is about 15616.4950933300. The cubic root of 243874919 is about 624.7731819090.

The spelling of 243874919 in words is "two hundred forty-three million, eight hundred seventy-four thousand, nine hundred nineteen".