243404201 has 4 divisors (see below), whose sum is σ = 245181012. Its totient is φ = 241627392.

The previous prime is 243404177. The next prime is 243404207. The reversal of 243404201 is 102404342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 102404342 = 2 ⋅51202171.

It can be written as a sum of positive squares in 2 ways, for example, as 44622400 + 198781801 = 6680^2 + 14099^2 .

It is a cyclic number.

It is not a de Polignac number, because 243404201 - 2²² = 239209897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243404207) 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, 888200 + ... + 888473.

It is an arithmetic number, because the mean of its divisors is an integer number (61295253).

Almost surely, 2^243404201 is an apocalyptic number.

It is an amenable number.

243404201 is a deficient number, since it is larger than the sum of its proper divisors (1776811).

243404201 is a wasteful number, since it uses less digits than its factorization.

243404201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776810.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 243404201 is about 15601.4166343957. The cubic root of 243404201 is about 624.3709519434.

Adding to 243404201 its reverse (102404342), we get a palindrome (345808543).

The spelling of 243404201 in words is "two hundred forty-three million, four hundred four thousand, two hundred one".