243925901 has 2 divisors, whose sum is σ = 243925902. Its totient is φ = 243925900.

The previous prime is 243925889. The next prime is 243925919. The reversal of 243925901 is 109529342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144624676 + 99301225 = 12026^2 + 9965^2 .

It is a cyclic number.

It is not a de Polignac number, because 243925901 - 2⁶ = 243925837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243925921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121962950 + 121962951.

It is an arithmetic number, because the mean of its divisors is an integer number (121962951).

Almost surely, 2^243925901 is an apocalyptic number.

It is an amenable number.

243925901 is a deficient number, since it is larger than the sum of its proper divisors (1).

243925901 is an equidigital number, since it uses as much as digits as its factorization.

243925901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 243925901 is about 15618.1273205209. The cubic root of 243925901 is about 624.8167151092.

The spelling of 243925901 in words is "two hundred forty-three million, nine hundred twenty-five thousand, nine hundred one".