109691 has 4 divisors (see below), whose sum is σ = 110400. Its totient is φ = 108984.

The previous prime is 109673. The next prime is 109717. The reversal of 109691 is 196901.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 109691 - 2¹⁴ = 93307 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 109691.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 109691.

It is not an unprimeable number, because it can be changed into a prime (109621) 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, 11 + ... + 468.

It is an arithmetic number, because the mean of its divisors is an integer number (27600).

2¹⁰⁹⁶⁹¹ is an apocalyptic number.

109691 is a deficient number, since it is larger than the sum of its proper divisors (709).

109691 is an equidigital number, since it uses as much as digits as its factorization.

109691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 109691 is about 331.1963164046. The cubic root of 109691 is about 47.8692913817.

The spelling of 109691 in words is "one hundred nine thousand, six hundred ninety-one".