243645489 has 10 divisors (see below), whose sum is σ = 363964370. Its totient is φ = 162430272.

The previous prime is 243645487. The next prime is 243645497. The reversal of 243645489 is 984546342.

243645489 is a `hidden beast` number, since 2 + 43 + 64 + 548 + 9 = 666.

243645489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 193349025 + 50296464 = 13905^2 + 7092^2 .

It is not a de Polignac number, because 243645489 - 2¹ = 243645487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243645487) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1503904 + ... + 1504065.

It is an arithmetic number, because the mean of its divisors is an integer number (36396437).

Almost surely, 2^243645489 is an apocalyptic number.

It is an amenable number.

243645489 is a deficient number, since it is larger than the sum of its proper divisors (120318881).

243645489 is an equidigital number, since it uses as much as digits as its factorization.

243645489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3007981 (or 3007972 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 243645489 is about 15609.1476064518. The cubic root of 243645489 is about 624.5771979927.

The spelling of 243645489 in words is "two hundred forty-three million, six hundred forty-five thousand, four hundred eighty-nine".