243224999 has 4 divisors (see below), whose sum is σ = 243501336. Its totient is φ = 242948664.

The previous prime is 243224959. The next prime is 243225007. The reversal of 243224999 is 999422342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999422342 = 2 ⋅499711171.

It is a cyclic number.

It is not a de Polignac number, because 243224999 - 2⁸ = 243224743 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 (243224959) 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, 136844 + ... + 138609.

It is an arithmetic number, because the mean of its divisors is an integer number (60875334).

Almost surely, 2^243224999 is an apocalyptic number.

243224999 is a deficient number, since it is larger than the sum of its proper divisors (276337).

243224999 is an equidigital number, since it uses as much as digits as its factorization.

243224999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276336.

The product of its digits is 279936, while the sum is 44.

The square root of 243224999 is about 15595.6724446239. The cubic root of 243224999 is about 624.2176870001.

The spelling of 243224999 in words is "two hundred forty-three million, two hundred twenty-four thousand, nine hundred ninety-nine".