691089 has 8 divisors (see below), whose sum is σ = 1053120. Its totient is φ = 394896.

The previous prime is 691079. The next prime is 691109. The reversal of 691089 is 980196.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 691089 - 2¹¹ = 689041 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (691079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16434 + ... + 16475.

It is an arithmetic number, because the mean of its divisors is an integer number (131640).

2⁶⁹¹⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

691089 is a deficient number, since it is larger than the sum of its proper divisors (362031).

691089 is a wasteful number, since it uses less digits than its factorization.

691089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32919.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 691089 is about 831.3176288279. The cubic root of 691089 is about 88.4120227569.

The spelling of 691089 in words is "six hundred ninety-one thousand, eighty-nine".