689321 has 2 divisors, whose sum is σ = 689322. Its totient is φ = 689320.

The previous prime is 689317. The next prime is 689341. The reversal of 689321 is 123986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 583696 + 105625 = 764^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 689321 - 2² = 689317 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (689341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344660 + 344661.

It is an arithmetic number, because the mean of its divisors is an integer number (344661).

2⁶⁸⁹³²¹ is an apocalyptic number.

It is an amenable number.

689321 is a deficient number, since it is larger than the sum of its proper divisors (1).

689321 is an equidigital number, since it uses as much as digits as its factorization.

689321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 689321 is about 830.2535757225. The cubic root of 689321 is about 88.3365641000.

The spelling of 689321 in words is "six hundred eighty-nine thousand, three hundred twenty-one".