243770641 has 2 divisors, whose sum is σ = 243770642. Its totient is φ = 243770640.

The previous prime is 243770617. The next prime is 243770663. The reversal of 243770641 is 146077342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230918416 + 12852225 = 15196^2 + 3585^2 .

It is a cyclic number.

It is not a de Polignac number, because 243770641 - 2¹⁵ = 243737873 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243770597 and 243770606.

It is not a weakly prime, because it can be changed into another prime (243770441) 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, 121885320 + 121885321.

It is an arithmetic number, because the mean of its divisors is an integer number (121885321).

Almost surely, 2^243770641 is an apocalyptic number.

It is an amenable number.

243770641 is a deficient number, since it is larger than the sum of its proper divisors (1).

243770641 is an equidigital number, since it uses as much as digits as its factorization.

243770641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 243770641 is about 15613.1560230467. The cubic root of 243770641 is about 624.6841206993.

It can be divided in two parts, 243 and 770641, that added together give a square (770884 = 878²).

The spelling of 243770641 in words is "two hundred forty-three million, seven hundred seventy thousand, six hundred forty-one".