243993287 has 2 divisors, whose sum is σ = 243993288. Its totient is φ = 243993286.

The previous prime is 243993283. The next prime is 243993313. The reversal of 243993287 is 782399342.

243993287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243993287 - 2² = 243993283 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243993283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121996643 + 121996644.

It is an arithmetic number, because the mean of its divisors is an integer number (121996644).

Almost surely, 2^243993287 is an apocalyptic number.

243993287 is a deficient number, since it is larger than the sum of its proper divisors (1).

243993287 is an equidigital number, since it uses as much as digits as its factorization.

243993287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 47.

The square root of 243993287 is about 15620.2844724416. The cubic root of 243993287 is about 624.8742462726.

The spelling of 243993287 in words is "two hundred forty-three million, nine hundred ninety-three thousand, two hundred eighty-seven".