243961567 has 2 divisors, whose sum is σ = 243961568. Its totient is φ = 243961566.

The previous prime is 243961481. The next prime is 243961573. The reversal of 243961567 is 765169342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243961567 - 2¹¹ = 243959519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243961867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121980783 + 121980784.

It is an arithmetic number, because the mean of its divisors is an integer number (121980784).

Almost surely, 2^243961567 is an apocalyptic number.

243961567 is a deficient number, since it is larger than the sum of its proper divisors (1).

243961567 is an equidigital number, since it uses as much as digits as its factorization.

243961567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 43.

The square root of 243961567 is about 15619.2690930146. The cubic root of 243961567 is about 624.8471664701.

The spelling of 243961567 in words is "two hundred forty-three million, nine hundred sixty-one thousand, five hundred sixty-seven".