243213455 has 4 divisors (see below), whose sum is σ = 291856152. Its totient is φ = 194570760.

The previous prime is 243213409. The next prime is 243213457. The reversal of 243213455 is 554312342.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 243213455 - 2⁸ = 243213199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243213457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24321341 + ... + 24321350.

It is an arithmetic number, because the mean of its divisors is an integer number (72964038).

Almost surely, 2^243213455 is an apocalyptic number.

243213455 is a deficient number, since it is larger than the sum of its proper divisors (48642697).

243213455 is an equidigital number, since it uses as much as digits as its factorization.

243213455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48642696.

The product of its digits is 14400, while the sum is 29.

The square root of 243213455 is about 15595.3023375631. The cubic root of 243213455 is about 624.2078112568.

Adding to 243213455 its reverse (554312342), we get a palindrome (797525797).

The spelling of 243213455 in words is "two hundred forty-three million, two hundred thirteen thousand, four hundred fifty-five".