243865025 has 6 divisors (see below), whose sum is σ = 302392662. Its totient is φ = 195092000.

The previous prime is 243864989. The next prime is 243865043. The reversal of 243865025 is 520568342.

It can be written as a sum of positive squares in 3 ways, for example, as 4946176 + 238918849 = 2224^2 + 15457^2 .

It is not a de Polignac number, because 243865025 - 2⁸ = 243864769 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4877276 + ... + 4877325.

It is an arithmetic number, because the mean of its divisors is an integer number (50398777).

Almost surely, 2^243865025 is an apocalyptic number.

243865025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243865025 is a deficient number, since it is larger than the sum of its proper divisors (58527637).

243865025 is an equidigital number, since it uses as much as digits as its factorization.

243865025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9754611 (or 9754606 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 243865025 is about 15616.1783096890. The cubic root of 243865025 is about 624.7647327834.

The spelling of 243865025 in words is "two hundred forty-three million, eight hundred sixty-five thousand, twenty-five".