243960889 has 2 divisors, whose sum is σ = 243960890. Its totient is φ = 243960888.

The previous prime is 243960881. The next prime is 243960949. The reversal of 243960889 is 988069342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238239225 + 5721664 = 15435^2 + 2392^2 .

It is a cyclic number.

It is not a de Polignac number, because 243960889 - 2³ = 243960881 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243960881) 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 as a sum of consecutive naturals, namely, 121980444 + 121980445.

It is an arithmetic number, because the mean of its divisors is an integer number (121980445).

Almost surely, 2^243960889 is an apocalyptic number.

It is an amenable number.

243960889 is a deficient number, since it is larger than the sum of its proper divisors (1).

243960889 is an equidigital number, since it uses as much as digits as its factorization.

243960889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 49.

The square root of 243960889 is about 15619.2473890389. The cubic root of 243960889 is about 624.8465876265.

The spelling of 243960889 in words is "two hundred forty-three million, nine hundred sixty thousand, eight hundred eighty-nine".