791689 has 4 divisors (see below), whose sum is σ = 813124. Its totient is φ = 770256.

The previous prime is 791677. The next prime is 791699. The reversal of 791689 is 986197.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 751689 + 40000 = 867^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 791689 - 2⁵ = 791657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (791629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10662 + ... + 10735.

It is an arithmetic number, because the mean of its divisors is an integer number (203281).

2⁷⁹¹⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

791689 is a deficient number, since it is larger than the sum of its proper divisors (21435).

791689 is a wasteful number, since it uses less digits than its factorization.

791689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21434.

The product of its digits is 27216, while the sum is 40.

The square root of 791689 is about 889.7690711640. The cubic root of 791689 is about 92.5091882765.

The spelling of 791689 in words is "seven hundred ninety-one thousand, six hundred eighty-nine".