243415261 has 2 divisors, whose sum is σ = 243415262. Its totient is φ = 243415260.

The previous prime is 243415259. The next prime is 243415309. The reversal of 243415261 is 162514342.

243415261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167184900 + 76230361 = 12930^2 + 8731^2 .

It is a cyclic number.

It is not a de Polignac number, because 243415261 - 2¹ = 243415259 is a prime.

Together with 243415259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243418261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121707630 + 121707631.

It is an arithmetic number, because the mean of its divisors is an integer number (121707631).

Almost surely, 2^243415261 is an apocalyptic number.

It is an amenable number.

243415261 is a deficient number, since it is larger than the sum of its proper divisors (1).

243415261 is an equidigital number, since it uses as much as digits as its factorization.

243415261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 28.

The square root of 243415261 is about 15601.7710853608. The cubic root of 243415261 is about 624.3804086936.

The spelling of 243415261 in words is "two hundred forty-three million, four hundred fifteen thousand, two hundred sixty-one".