243925691 has 2 divisors, whose sum is σ = 243925692. Its totient is φ = 243925690.

The previous prime is 243925681. The next prime is 243925729. The reversal of 243925691 is 196529342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243925691 - 2¹⁴ = 243909307 is a prime.

It is not a weakly prime, because it can be changed into another prime (243925601) 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, 121962845 + 121962846.

It is an arithmetic number, because the mean of its divisors is an integer number (121962846).

Almost surely, 2^243925691 is an apocalyptic number.

243925691 is a deficient number, since it is larger than the sum of its proper divisors (1).

243925691 is an equidigital number, since it uses as much as digits as its factorization.

243925691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 41.

The square root of 243925691 is about 15618.1205975623. The cubic root of 243925691 is about 624.8165358040.

The spelling of 243925691 in words is "two hundred forty-three million, nine hundred twenty-five thousand, six hundred ninety-one".