289491889 has 2 divisors, whose sum is σ = 289491890. Its totient is φ = 289491888.

The previous prime is 289491887. The next prime is 289491907. The reversal of 289491889 is 988194982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 256544289 + 32947600 = 16017^2 + 5740^2 .

It is a cyclic number.

It is not a de Polignac number, because 289491889 - 2¹ = 289491887 is a prime.

Together with 289491887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (289491887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144745944 + 144745945.

It is an arithmetic number, because the mean of its divisors is an integer number (144745945).

Almost surely, 2^289491889 is an apocalyptic number.

It is an amenable number.

289491889 is a deficient number, since it is larger than the sum of its proper divisors (1).

289491889 is an equidigital number, since it uses as much as digits as its factorization.

289491889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2985984, while the sum is 58.

The square root of 289491889 is about 17014.4611727789. The cubic root of 289491889 is about 661.5237894338.

The spelling of 289491889 in words is "two hundred eighty-nine million, four hundred ninety-one thousand, eight hundred eighty-nine".