691683 has 4 divisors (see below), whose sum is σ = 922248. Its totient is φ = 461120.

The previous prime is 691681. The next prime is 691687. The reversal of 691683 is 386196.

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

It is a cyclic number.

It is not a de Polignac number, because 691683 - 2¹ = 691681 is a prime.

It is a D-number.

691683 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (691681) 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 3 ways as a sum of consecutive naturals, for example, 115278 + ... + 115283.

It is an arithmetic number, because the mean of its divisors is an integer number (230562).

2⁶⁹¹⁶⁸³ is an apocalyptic number.

691683 is a deficient number, since it is larger than the sum of its proper divisors (230565).

691683 is a wasteful number, since it uses less digits than its factorization.

691683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230564.

The product of its digits is 7776, while the sum is 33.

The square root of 691683 is about 831.6748162593. The cubic root of 691683 is about 88.4373459315.

The spelling of 691683 in words is "six hundred ninety-one thousand, six hundred eighty-three".