691941 has 4 divisors (see below), whose sum is σ = 922592. Its totient is φ = 461292.

The previous prime is 691931. The next prime is 691949. The reversal of 691941 is 149196.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 691941 - 2⁶ = 691877 is a prime.

It is a D-number.

It is a Duffinian number.

691941 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 691899 and 691908.

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 691941.

It is not an unprimeable number, because it can be changed into a prime (691949) 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, 115321 + ... + 115326.

It is an arithmetic number, because the mean of its divisors is an integer number (230648).

2⁶⁹¹⁹⁴¹ is an apocalyptic number.

It is an amenable number.

691941 is a deficient number, since it is larger than the sum of its proper divisors (230651).

691941 is a wasteful number, since it uses less digits than its factorization.

691941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230650.

The product of its digits is 1944, while the sum is 30.

The square root of 691941 is about 831.8299104985. The cubic root of 691941 is about 88.4483403702.

The spelling of 691941 in words is "six hundred ninety-one thousand, nine hundred forty-one".