691383 has 32 divisors (see below), whose sum is σ = 1193472. Its totient is φ = 345600.

The previous prime is 691381. The next prime is 691399. The reversal of 691383 is 383196.

It is not a de Polignac number, because 691383 - 2¹ = 691381 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 691383.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691383.

It is not an unprimeable number, because it can be changed into a prime (691381) 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 31 ways as a sum of consecutive naturals, for example, 9435 + ... + 9507.

It is an arithmetic number, because the mean of its divisors is an integer number (37296).

2⁶⁹¹³⁸³ is an apocalyptic number.

691383 is a deficient number, since it is larger than the sum of its proper divisors (502089).

691383 is a wasteful number, since it uses less digits than its factorization.

691383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135.

The product of its digits is 3888, while the sum is 30.

The square root of 691383 is about 831.4944377445. The cubic root of 691383 is about 88.4245582622.

It can be divided in two parts, 6913 and 83, that added together give a palindrome (6996).

The spelling of 691383 in words is "six hundred ninety-one thousand, three hundred eighty-three".