243481009 has 4 divisors (see below), whose sum is σ = 248661504. Its totient is φ = 238300516.

The previous prime is 243480997. The next prime is 243481033. The reversal of 243481009 is 900184342.

243481009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 900184342 = 2 ⋅450092171.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243481009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243481079) 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, 2590177 + ... + 2590270.

It is an arithmetic number, because the mean of its divisors is an integer number (62165376).

Almost surely, 2^243481009 is an apocalyptic number.

It is an amenable number.

243481009 is a deficient number, since it is larger than the sum of its proper divisors (5180495).

243481009 is an equidigital number, since it uses as much as digits as its factorization.

243481009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5180494.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 243481009 is about 15603.8780115714. The cubic root of 243481009 is about 624.4366199973.

The spelling of 243481009 in words is "two hundred forty-three million, four hundred eighty-one thousand, nine".