243489289 has 4 divisors (see below), whose sum is σ = 244499860. Its totient is φ = 242478720.

The previous prime is 243489287. The next prime is 243489329. The reversal of 243489289 is 982984342.

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

It can be written as a sum of positive squares in 2 ways, for example, as 78623689 + 164865600 = 8867^2 + 12840^2 .

It is a cyclic number.

It is not a de Polignac number, because 243489289 - 2¹ = 243489287 is a prime.

It is a super-3 number, since 3×243489289³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243489287) 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, 504924 + ... + 505405.

It is an arithmetic number, because the mean of its divisors is an integer number (61124965).

Almost surely, 2^243489289 is an apocalyptic number.

It is an amenable number.

243489289 is a deficient number, since it is larger than the sum of its proper divisors (1010571).

243489289 is a wasteful number, since it uses less digits than its factorization.

243489289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010570.

The product of its digits is 995328, while the sum is 49.

The square root of 243489289 is about 15604.1433279754. The cubic root of 243489289 is about 624.4436982723.

The spelling of 243489289 in words is "two hundred forty-three million, four hundred eighty-nine thousand, two hundred eighty-nine".