243250409 has 2 divisors, whose sum is σ = 243250410. Its totient is φ = 243250408.

The previous prime is 243250387. The next prime is 243250421. The reversal of 243250409 is 904052342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195916009 + 47334400 = 13997^2 + 6880^2 .

It is a cyclic number.

It is not a de Polignac number, because 243250409 - 2⁸ = 243250153 is a prime.

It is a super-2 number, since 2×243250409² = 118341522957334562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243270409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121625204 + 121625205.

It is an arithmetic number, because the mean of its divisors is an integer number (121625205).

Almost surely, 2^243250409 is an apocalyptic number.

It is an amenable number.

243250409 is a deficient number, since it is larger than the sum of its proper divisors (1).

243250409 is an equidigital number, since it uses as much as digits as its factorization.

243250409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 243250409 is about 15596.4870724147. The cubic root of 243250409 is about 624.2394238270.

The spelling of 243250409 in words is "two hundred forty-three million, two hundred fifty thousand, four hundred nine".