921589 has 2 divisors, whose sum is σ = 921590. Its totient is φ = 921588.

The previous prime is 921581. The next prime is 921601. The reversal of 921589 is 985129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 887364 + 34225 = 942^2 + 185^2 .

It is an emirp because it is prime and its reverse (985129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 921589 - 2³ = 921581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460794 + 460795.

It is an arithmetic number, because the mean of its divisors is an integer number (460795).

2⁹²¹⁵⁸⁹ is an apocalyptic number.

It is an amenable number.

921589 is a deficient number, since it is larger than the sum of its proper divisors (1).

921589 is an equidigital number, since it uses as much as digits as its factorization.

921589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 34.

The square root of 921589 is about 959.9942708162. The cubic root of 921589 is about 97.3148447504.

It can be divided in two parts, 92 and 1589, that added together give a square (1681 = 41²).

The spelling of 921589 in words is "nine hundred twenty-one thousand, five hundred eighty-nine".