289647689 has 2 divisors, whose sum is σ = 289647690. Its totient is φ = 289647688.

The previous prime is 289647661. The next prime is 289647691. The reversal of 289647689 is 986746982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176438089 + 113209600 = 13283^2 + 10640^2 .

It is a cyclic number.

It is not a de Polignac number, because 289647689 - 2¹² = 289643593 is a prime.

Together with 289647691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (289647089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144823844 + 144823845.

It is an arithmetic number, because the mean of its divisors is an integer number (144823845).

Almost surely, 2^289647689 is an apocalyptic number.

It is an amenable number.

289647689 is a deficient number, since it is larger than the sum of its proper divisors (1).

289647689 is an equidigital number, since it uses as much as digits as its factorization.

289647689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 59.

The square root of 289647689 is about 17019.0390151736. The cubic root of 289647689 is about 661.6424420644.

The spelling of 289647689 in words is "two hundred eighty-nine million, six hundred forty-seven thousand, six hundred eighty-nine".