691946 has 8 divisors (see below), whose sum is σ = 1042500. Its totient is φ = 344448.

The previous prime is 691931. The next prime is 691949. The reversal of 691946 is 649196.

It can be written as a sum of positive squares in 2 ways, for example, as 657721 + 34225 = 811^2 + 185^2 .

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691946.

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, 71 + ... + 1178.

2⁶⁹¹⁹⁴⁶ is an apocalyptic number.

691946 is a deficient number, since it is larger than the sum of its proper divisors (350554).

691946 is a wasteful number, since it uses less digits than its factorization.

691946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528.

The product of its digits is 11664, while the sum is 35.

The square root of 691946 is about 831.8329159152. The cubic root of 691946 is about 88.4485534137.

The spelling of 691946 in words is "six hundred ninety-one thousand, nine hundred forty-six".