243847841 has 2 divisors, whose sum is σ = 243847842. Its totient is φ = 243847840.

The previous prime is 243847823. The next prime is 243847853. The reversal of 243847841 is 148748342.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235315600 + 8532241 = 15340^2 + 2921^2 .

It is a cyclic number.

It is not a de Polignac number, because 243847841 - 2⁶ = 243847777 is a prime.

It is a super-2 number, since 2×243847841² = 118923539120722562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243847801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121923920 + 121923921.

It is an arithmetic number, because the mean of its divisors is an integer number (121923921).

Almost surely, 2^243847841 is an apocalyptic number.

It is an amenable number.

243847841 is a deficient number, since it is larger than the sum of its proper divisors (1).

243847841 is an equidigital number, since it uses as much as digits as its factorization.

243847841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172032, while the sum is 41.

The square root of 243847841 is about 15615.6281013605. The cubic root of 243847841 is about 624.7500577128.

The spelling of 243847841 in words is "two hundred forty-three million, eight hundred forty-seven thousand, eight hundred forty-one".