243421431 has 8 divisors (see below), whose sum is σ = 354067584. Its totient is φ = 147528120.

The previous prime is 243421417. The next prime is 243421481. The reversal of 243421431 is 134124342.

243421431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 243421431 - 2⁷ = 243421303 is a prime.

It is a super-2 number, since 2×243421431² = 118507986140175522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243421411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3688171 + ... + 3688236.

It is an arithmetic number, because the mean of its divisors is an integer number (44258448).

Almost surely, 2^243421431 is an apocalyptic number.

243421431 is a deficient number, since it is larger than the sum of its proper divisors (110646153).

243421431 is a wasteful number, since it uses less digits than its factorization.

243421431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7376421.

The product of its digits is 2304, while the sum is 24.

The square root of 243421431 is about 15601.9688180691. The cubic root of 243421431 is about 624.3856841702.

Adding to 243421431 its reverse (134124342), we get a palindrome (377545773).

The spelling of 243421431 in words is "two hundred forty-three million, four hundred twenty-one thousand, four hundred thirty-one".