280589 has 2 divisors, whose sum is σ = 280590. Its totient is φ = 280588.

The previous prime is 280583. The next prime is 280591. The reversal of 280589 is 985082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218089 + 62500 = 467^2 + 250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280589 is a prime.

Together with 280591, 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 (280583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140294 + 140295.

It is an arithmetic number, because the mean of its divisors is an integer number (140295).

2²⁸⁰⁵⁸⁹ is an apocalyptic number.

It is an amenable number.

280589 is a deficient number, since it is larger than the sum of its proper divisors (1).

280589 is an equidigital number, since it uses as much as digits as its factorization.

280589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 280589 is about 529.7065225198. The cubic root of 280589 is about 65.4671668866.

The spelling of 280589 in words is "two hundred eighty thousand, five hundred eighty-nine".