243403001 has 4 divisors (see below), whose sum is σ = 244860672. Its totient is φ = 241945332.

The previous prime is 243402953. The next prime is 243403007. The reversal of 243403001 is 100304342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243403001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243403007) 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, 728585 + ... + 728918.

It is an arithmetic number, because the mean of its divisors is an integer number (61215168).

Almost surely, 2^243403001 is an apocalyptic number.

It is an amenable number.

243403001 is a deficient number, since it is larger than the sum of its proper divisors (1457671).

243403001 is a wasteful number, since it uses less digits than its factorization.

243403001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457670.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 243403001 is about 15601.3781763022. The cubic root of 243403001 is about 624.3699258773.

Adding to 243403001 its reverse (100304342), we get a palindrome (343707343).

The spelling of 243403001 in words is "two hundred forty-three million, four hundred three thousand, one".