243903841 has 2 divisors, whose sum is σ = 243903842. Its totient is φ = 243903840.

The previous prime is 243903823. The next prime is 243903851. The reversal of 243903841 is 148309342.

243903841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184552225 + 59351616 = 13585^2 + 7704^2 .

It is a cyclic number.

It is not a de Polignac number, because 243903841 - 2⁷ = 243903713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243903797 and 243903806.

It is not a weakly prime, because it can be changed into another prime (243903851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121951920 + 121951921.

It is an arithmetic number, because the mean of its divisors is an integer number (121951921).

Almost surely, 2^243903841 is an apocalyptic number.

It is an amenable number.

243903841 is a deficient number, since it is larger than the sum of its proper divisors (1).

243903841 is an equidigital number, since it uses as much as digits as its factorization.

243903841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 243903841 is about 15617.4210739161. The cubic root of 243903841 is about 624.7978789624.

The spelling of 243903841 in words is "two hundred forty-three million, nine hundred three thousand, eight hundred forty-one".