689771 has 2 divisors, whose sum is σ = 689772. Its totient is φ = 689770.

The previous prime is 689761. The next prime is 689779. The reversal of 689771 is 177986.

It is a happy number.

689771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 689771 - 2¹⁰ = 688747 is a prime.

It is not a weakly prime, because it can be changed into another prime (689779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344885 + 344886.

It is an arithmetic number, because the mean of its divisors is an integer number (344886).

2⁶⁸⁹⁷⁷¹ is an apocalyptic number.

689771 is a deficient number, since it is larger than the sum of its proper divisors (1).

689771 is an equidigital number, since it uses as much as digits as its factorization.

689771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 38.

The square root of 689771 is about 830.5245330513. The cubic root of 689771 is about 88.3557824356.

The spelling of 689771 in words is "six hundred eighty-nine thousand, seven hundred seventy-one".