243030409 has 2 divisors, whose sum is σ = 243030410. Its totient is φ = 243030408.

The previous prime is 243030401. The next prime is 243030439. The reversal of 243030409 is 904030342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147088384 + 95942025 = 12128^2 + 9795^2 .

It is a cyclic number.

It is not a de Polignac number, because 243030409 - 2³ = 243030401 is a prime.

It is not a weakly prime, because it can be changed into another prime (243030401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121515204 + 121515205.

It is an arithmetic number, because the mean of its divisors is an integer number (121515205).

Almost surely, 2^243030409 is an apocalyptic number.

It is an amenable number.

243030409 is a deficient number, since it is larger than the sum of its proper divisors (1).

243030409 is an equidigital number, since it uses as much as digits as its factorization.

243030409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 243030409 is about 15589.4326067372. The cubic root of 243030409 is about 624.0511759817.

The spelling of 243030409 in words is "two hundred forty-three million, thirty thousand, four hundred nine".