243794891 has 2 divisors, whose sum is σ = 243794892. Its totient is φ = 243794890.

The previous prime is 243794879. The next prime is 243794893. The reversal of 243794891 is 198497342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243794891 - 2⁶ = 243794827 is a prime.

Together with 243794893, 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 (243794893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121897445 + 121897446.

It is an arithmetic number, because the mean of its divisors is an integer number (121897446).

Almost surely, 2^243794891 is an apocalyptic number.

243794891 is a deficient number, since it is larger than the sum of its proper divisors (1).

243794891 is an equidigital number, since it uses as much as digits as its factorization.

243794891 is an evil number, because the sum of its binary digits is even.

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

The square root of 243794891 is about 15613.9325923996. The cubic root of 243794891 is about 624.7048342788.

The spelling of 243794891 in words is "two hundred forty-three million, seven hundred ninety-four thousand, eight hundred ninety-one".