289808989 has 2 divisors, whose sum is σ = 289808990. Its totient is φ = 289808988.

The previous prime is 289808963. The next prime is 289808999. The reversal of 289808989 is 989808982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 284596900 + 5212089 = 16870^2 + 2283^2 .

It is a cyclic number.

It is not a de Polignac number, because 289808989 - 2¹⁹ = 289284701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289808999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144904494 + 144904495.

It is an arithmetic number, because the mean of its divisors is an integer number (144904495).

Almost surely, 2^289808989 is an apocalyptic number.

It is an amenable number.

289808989 is a deficient number, since it is larger than the sum of its proper divisors (1).

289808989 is an equidigital number, since it uses as much as digits as its factorization.

289808989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5971968, while the sum is 61.

The square root of 289808989 is about 17023.7771660698. Note that the first 3 decimals coincide. The cubic root of 289808989 is about 661.7652385114.

The spelling of 289808989 in words is "two hundred eighty-nine million, eight hundred eight thousand, nine hundred eighty-nine".