243554039 has 2 divisors, whose sum is σ = 243554040. Its totient is φ = 243554038.

The previous prime is 243554009. The next prime is 243554081. The reversal of 243554039 is 930455342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243554039 - 2²⁰ = 242505463 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243554009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121777019 + 121777020.

It is an arithmetic number, because the mean of its divisors is an integer number (121777020).

Almost surely, 2^243554039 is an apocalyptic number.

243554039 is a deficient number, since it is larger than the sum of its proper divisors (1).

243554039 is an equidigital number, since it uses as much as digits as its factorization.

243554039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 243554039 is about 15606.2179595186. The cubic root of 243554039 is about 624.4990451915.

The spelling of 243554039 in words is "two hundred forty-three million, five hundred fifty-four thousand, thirty-nine".