691996 has 6 divisors (see below), whose sum is σ = 1211000. Its totient is φ = 345996.

The previous prime is 691991. The next prime is 691997. The reversal of 691996 is 699196.

691996 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86496 + ... + 86503.

2⁶⁹¹⁹⁹⁶ is an apocalyptic number.

It is an amenable number.

691996 is a deficient number, since it is larger than the sum of its proper divisors (519004).

691996 is a wasteful number, since it uses less digits than its factorization.

691996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173003 (or 173001 counting only the distinct ones).

The product of its digits is 26244, while the sum is 40.

The square root of 691996 is about 831.8629694848. The cubic root of 691996 is about 88.4506837925.

The spelling of 691996 in words is "six hundred ninety-one thousand, nine hundred ninety-six".