243000001 has 4 divisors (see below), whose sum is σ = 243031252. Its totient is φ = 242968752.

The previous prime is 242999963. The next prime is 243000007. The reversal of 243000001 is 100000342.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 27615025 + 215384976 = 5255^2 + 14676^2 .

It is a cyclic number.

It is not a de Polignac number, because 243000001 - 2⁹ = 242999489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243000007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6211 + ... + 22903.

It is an arithmetic number, because the mean of its divisors is an integer number (60757813).

It is a 7776-hyperperfect number.

Almost surely, 2^243000001 is an apocalyptic number.

It is an amenable number.

243000001 is a deficient number, since it is larger than the sum of its proper divisors (31251).

243000001 is a wasteful number, since it uses less digits than its factorization.

243000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31250.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 243000001 is about 15588.4573001949. The cubic root of 243000001 is about 624.0251477716.

Adding to 243000001 its reverse (100000342), we get a palindrome (343000343).

It can be divided in two parts, 24 and 3000001, that added together give a triangular number (3000025 = T₂₄₄₉).

The spelling of 243000001 in words is "two hundred forty-three million, one", and thus it is an aban number.