689597 has 2 divisors, whose sum is σ = 689598. Its totient is φ = 689596.

The previous prime is 689587. The next prime is 689599. The reversal of 689597 is 795986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 534361 + 155236 = 731^2 + 394^2 .

It is a cyclic number.

It is not a de Polignac number, because 689597 - 2⁴ = 689581 is a prime.

Together with 689599, 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 (689599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344798 + 344799.

It is an arithmetic number, because the mean of its divisors is an integer number (344799).

2⁶⁸⁹⁵⁹⁷ is an apocalyptic number.

It is an amenable number.

689597 is a deficient number, since it is larger than the sum of its proper divisors (1).

689597 is an equidigital number, since it uses as much as digits as its factorization.

689597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 44.

The square root of 689597 is about 830.4197733677. The cubic root of 689597 is about 88.3483523373.

The spelling of 689597 in words is "six hundred eighty-nine thousand, five hundred ninety-seven".