243100399 has 2 divisors, whose sum is σ = 243100400. Its totient is φ = 243100398.

The previous prime is 243100393. The next prime is 243100427. The reversal of 243100399 is 993001342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243100399 - 2⁵ = 243100367 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 243100399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243100393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121550199 + 121550200.

It is an arithmetic number, because the mean of its divisors is an integer number (121550200).

Almost surely, 2^243100399 is an apocalyptic number.

243100399 is a deficient number, since it is larger than the sum of its proper divisors (1).

243100399 is an equidigital number, since it uses as much as digits as its factorization.

243100399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 243100399 is about 15591.6772349866. The cubic root of 243100399 is about 624.1110767842. Note that the first 3 decimals are identical.

The spelling of 243100399 in words is "two hundred forty-three million, one hundred thousand, three hundred ninety-nine".