243447121 has 4 divisors (see below), whose sum is σ = 243817200. Its totient is φ = 243077044.

The previous prime is 243447119. The next prime is 243447131. The reversal of 243447121 is 121744342.

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 an emirpimes, since its reverse is a distinct semiprime: 121744342 = 2 ⋅60872171.

It is a cyclic number.

It is not a de Polignac number, because 243447121 - 2¹ = 243447119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243447121.

It is not an unprimeable number, because it can be changed into a prime (243447131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184051 + ... + 185368.

It is an arithmetic number, because the mean of its divisors is an integer number (60954300).

Almost surely, 2^243447121 is an apocalyptic number.

It is an amenable number.

243447121 is a deficient number, since it is larger than the sum of its proper divisors (370079).

243447121 is an equidigital number, since it uses as much as digits as its factorization.

243447121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370078.

The product of its digits is 5376, while the sum is 28.

The square root of 243447121 is about 15602.7920898793. The cubic root of 243447121 is about 624.4076486892.

The spelling of 243447121 in words is "two hundred forty-three million, four hundred forty-seven thousand, one hundred twenty-one".