289305889 has 2 divisors, whose sum is σ = 289305890. Its totient is φ = 289305888.

The previous prime is 289305871. The next prime is 289305899. The reversal of 289305889 is 988503982.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 288422289 + 883600 = 16983^2 + 940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-289305889 is a prime.

It is not a weakly prime, because it can be changed into another prime (289305839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144652944 + 144652945.

It is an arithmetic number, because the mean of its divisors is an integer number (144652945).

Almost surely, 2^289305889 is an apocalyptic number.

It is an amenable number.

289305889 is a deficient number, since it is larger than the sum of its proper divisors (1).

289305889 is an equidigital number, since it uses as much as digits as its factorization.

289305889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The square root of 289305889 is about 17008.9943559283. The cubic root of 289305889 is about 661.3820816221.

The spelling of 289305889 in words is "two hundred eighty-nine million, three hundred five thousand, eight hundred eighty-nine".