109811 has 4 divisors (see below), whose sum is σ = 118272. Its totient is φ = 101352.

The previous prime is 109807. The next prime is 109819. The reversal of 109811 is 118901.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 109811 - 2² = 109807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109819) 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, 4211 + ... + 4236.

It is an arithmetic number, because the mean of its divisors is an integer number (29568).

2¹⁰⁹⁸¹¹ is an apocalyptic number.

109811 is a deficient number, since it is larger than the sum of its proper divisors (8461).

109811 is an equidigital number, since it uses as much as digits as its factorization.

109811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8460.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 109811 is about 331.3774283200. The cubic root of 109811 is about 47.8867410707.

The spelling of 109811 in words is "one hundred nine thousand, eight hundred eleven".