243665001 has 24 divisors (see below), whose sum is σ = 359367840. Its totient is φ = 159061056.

The previous prime is 243664969. The next prime is 243665011. The reversal of 243665001 is 100566342.

243665001 is a `hidden beast` number, since 2 + 4 + 3 + 6 + 650 + 0 + 1 = 666.

It is not a de Polignac number, because 243665001 - 2⁵ = 243664969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243665011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84286 + ... + 87128.

It is an arithmetic number, because the mean of its divisors is an integer number (14973660).

Almost surely, 2^243665001 is an apocalyptic number.

It is an amenable number.

243665001 is a deficient number, since it is larger than the sum of its proper divisors (115702839).

243665001 is a wasteful number, since it uses less digits than its factorization.

243665001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045 (or 3042 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 243665001 is about 15609.7726120530. The cubic root of 243665001 is about 624.5938703377.

The spelling of 243665001 in words is "two hundred forty-three million, six hundred sixty-five thousand, one".