243484321 has 2 divisors, whose sum is σ = 243484322. Its totient is φ = 243484320.

The previous prime is 243484303. The next prime is 243484337. The reversal of 243484321 is 123484342.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241367296 + 2117025 = 15536^2 + 1455^2 .

It is a cyclic number.

It is not a de Polignac number, because 243484321 - 2⁵ = 243484289 is a prime.

It is a super-2 number, since 2×243484321² = 118569229145662082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243484391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121742160 + 121742161.

It is an arithmetic number, because the mean of its divisors is an integer number (121742161).

Almost surely, 2^243484321 is an apocalyptic number.

It is an amenable number.

243484321 is a deficient number, since it is larger than the sum of its proper divisors (1).

243484321 is an equidigital number, since it uses as much as digits as its factorization.

243484321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 31.

The square root of 243484321 is about 15603.9841386743. The cubic root of 243484321 is about 624.4394513266.

The spelling of 243484321 in words is "two hundred forty-three million, four hundred eighty-four thousand, three hundred twenty-one".