243040225 has 6 divisors (see below), whose sum is σ = 301369910. Its totient is φ = 194432160.

The previous prime is 243040201. The next prime is 243040247. The reversal of 243040225 is 522040342.

It can be written as a sum of positive squares in 3 ways, for example, as 30813601 + 212226624 = 5551^2 + 14568^2 .

It is a de Polignac number, because none of the positive numbers 2^k-243040225 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243040196 and 243040205.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 4860780 + ... + 4860829.

Almost surely, 2^243040225 is an apocalyptic number.

243040225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243040225 is a deficient number, since it is larger than the sum of its proper divisors (58329685).

243040225 is an equidigital number, since it uses as much as digits as its factorization.

243040225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9721619 (or 9721614 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 243040225 is about 15589.7474322068. The cubic root of 243040225 is about 624.0595776791.

Adding to 243040225 its reverse (522040342), we get a palindrome (765080567).

The spelling of 243040225 in words is "two hundred forty-three million, forty thousand, two hundred twenty-five".