243220099 has 2 divisors, whose sum is σ = 243220100. Its totient is φ = 243220098.

The previous prime is 243220097. The next prime is 243220189. The reversal of 243220099 is 990022342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243220099 - 2¹ = 243220097 is a prime.

Together with 243220097, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 243220099.

It is not a weakly prime, because it can be changed into another prime (243220097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121610049 + 121610050.

It is an arithmetic number, because the mean of its divisors is an integer number (121610050).

Almost surely, 2^243220099 is an apocalyptic number.

243220099 is a deficient number, since it is larger than the sum of its proper divisors (1).

243220099 is an equidigital number, since it uses as much as digits as its factorization.

243220099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 243220099 is about 15595.5153489713. The cubic root of 243220099 is about 624.2134951514.

The spelling of 243220099 in words is "two hundred forty-three million, two hundred twenty thousand, ninety-nine".