691096 has 48 divisors (see below), whose sum is σ = 1580040. Its totient is φ = 282240.

The previous prime is 691079. The next prime is 691109. The reversal of 691096 is 690196.

It is a super-2 number, since 2×691096² = 955227362432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

691096 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16051 + ... + 16093.

2⁶⁹¹⁰⁹⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (790020).

691096 is an abundant number, since it is smaller than the sum of its proper divisors (888944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691096 is a wasteful number, since it uses less digits than its factorization.

691096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 691096 is about 831.3218390010. The cubic root of 691096 is about 88.4123212626.

Subtracting from 691096 its reverse (690196), we obtain a square (900 = 30²).

The spelling of 691096 in words is "six hundred ninety-one thousand, ninety-six".