243220433 has 4 divisors (see below), whose sum is σ = 243253248. Its totient is φ = 243187620.

The previous prime is 243220421. The next prime is 243220447. The reversal of 243220433 is 334022342.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243220433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243220399 and 243220408.

It is not an unprimeable number, because it can be changed into a prime (243220633) 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, 560 + ... + 22062.

It is an arithmetic number, because the mean of its divisors is an integer number (60813312).

Almost surely, 2^243220433 is an apocalyptic number.

It is an amenable number.

243220433 is a deficient number, since it is larger than the sum of its proper divisors (32815).

243220433 is a wasteful number, since it uses less digits than its factorization.

243220433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32814.

The product of its (nonzero) digits is 3456, while the sum is 23.

The square root of 243220433 is about 15595.5260571742. The cubic root of 243220433 is about 624.2137808832.

Adding to 243220433 its reverse (334022342), we get a palindrome (577242775).

The spelling of 243220433 in words is "two hundred forty-three million, two hundred twenty thousand, four hundred thirty-three".