289991641 has 2 divisors, whose sum is σ = 289991642. Its totient is φ = 289991640.

The previous prime is 289991633. The next prime is 289991651. The reversal of 289991641 is 146199982.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 289136016 + 855625 = 17004^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 289991641 - 2³ = 289991633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (289991651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144995820 + 144995821.

It is an arithmetic number, because the mean of its divisors is an integer number (144995821).

Almost surely, 2^289991641 is an apocalyptic number.

It is an amenable number.

289991641 is a deficient number, since it is larger than the sum of its proper divisors (1).

289991641 is an equidigital number, since it uses as much as digits as its factorization.

289991641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 49.

The square root of 289991641 is about 17029.1409354671. The cubic root of 289991641 is about 661.9042350741.

The spelling of 289991641 in words is "two hundred eighty-nine million, nine hundred ninety-one thousand, six hundred forty-one".