243808157 has 2 divisors, whose sum is σ = 243808158. Its totient is φ = 243808156.

The previous prime is 243808153. The next prime is 243808177. The reversal of 243808157 is 751808342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236267641 + 7540516 = 15371^2 + 2746^2 .

It is a cyclic number.

It is not a de Polignac number, because 243808157 - 2² = 243808153 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243808157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243808153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121904078 + 121904079.

It is an arithmetic number, because the mean of its divisors is an integer number (121904079).

Almost surely, 2^243808157 is an apocalyptic number.

It is an amenable number.

243808157 is a deficient number, since it is larger than the sum of its proper divisors (1).

243808157 is an equidigital number, since it uses as much as digits as its factorization.

243808157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 243808157 is about 15614.3573995218. The cubic root of 243808157 is about 624.7161650932.

The spelling of 243808157 in words is "two hundred forty-three million, eight hundred eight thousand, one hundred fifty-seven".