689591 has 16 divisors (see below), whose sum is σ = 844800. Its totient is φ = 550368.

The previous prime is 689587. The next prime is 689597. The reversal of 689591 is 195986.

It is not a de Polignac number, because 689591 - 2² = 689587 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689597) 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 in 15 ways as a sum of consecutive naturals, for example, 8690 + ... + 8768.

It is an arithmetic number, because the mean of its divisors is an integer number (52800).

2⁶⁸⁹⁵⁹¹ is an apocalyptic number.

689591 is a deficient number, since it is larger than the sum of its proper divisors (155209).

689591 is a wasteful number, since it uses less digits than its factorization.

689591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158.

The product of its digits is 19440, while the sum is 38.

The square root of 689591 is about 830.4161607291. The cubic root of 689591 is about 88.3480961047.

The spelling of 689591 in words is "six hundred eighty-nine thousand, five hundred ninety-one".