109681 has 12 divisors (see below), whose sum is σ = 131760. Its totient is φ = 90480.

The previous prime is 109673. The next prime is 109717. The reversal of 109681 is 186901.

It is not a de Polignac number, because 109681 - 2³ = 109673 is a prime.

It is a super-2 number, since 2×109681² = 24059843522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1830 + ... + 1888.

It is an arithmetic number, because the mean of its divisors is an integer number (10980).

2¹⁰⁹⁶⁸¹ is an apocalyptic number.

109681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

109681 is a deficient number, since it is larger than the sum of its proper divisors (22079).

109681 is a wasteful number, since it uses less digits than its factorization.

109681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 109681 is about 331.1812192743. The cubic root of 109681 is about 47.8678366666.

The spelling of 109681 in words is "one hundred nine thousand, six hundred eighty-one".