289880621 has 2 divisors, whose sum is σ = 289880622. Its totient is φ = 289880620.

The previous prime is 289880611. The next prime is 289880623. The reversal of 289880621 is 126088982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 252364996 + 37515625 = 15886^2 + 6125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-289880621 is a prime.

Together with 289880623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289880623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144940310 + 144940311.

It is an arithmetic number, because the mean of its divisors is an integer number (144940311).

Almost surely, 2^289880621 is an apocalyptic number.

It is an amenable number.

289880621 is a deficient number, since it is larger than the sum of its proper divisors (1).

289880621 is an equidigital number, since it uses as much as digits as its factorization.

289880621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 289880621 is about 17025.8809170040. The cubic root of 289880621 is about 661.8197567911.

The spelling of 289880621 in words is "two hundred eighty-nine million, eight hundred eighty thousand, six hundred twenty-one".