289988549 has 2 divisors, whose sum is σ = 289988550. Its totient is φ = 289988548.

The previous prime is 289988537. The next prime is 289988551. The reversal of 289988549 is 945889982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 288388324 + 1600225 = 16982^2 + 1265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-289988549 is a prime.

It is a super-3 number, since 3×289988549³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 289988551, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 289988491 and 289988500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289988519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144994274 + 144994275.

It is an arithmetic number, because the mean of its divisors is an integer number (144994275).

Almost surely, 2^289988549 is an apocalyptic number.

It is an amenable number.

289988549 is a deficient number, since it is larger than the sum of its proper divisors (1).

289988549 is an equidigital number, since it uses as much as digits as its factorization.

289988549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14929920, while the sum is 62.

The square root of 289988549 is about 17029.0501496707. The cubic root of 289988549 is about 661.9018825751.

The spelling of 289988549 in words is "two hundred eighty-nine million, nine hundred eighty-eight thousand, five hundred forty-nine".