109855681 has 8 divisors (see below), whose sum is σ = 118414184. Its totient is φ = 101312640.

The previous prime is 109855657. The next prime is 109855709. The reversal of 109855681 is 186558901.

It can be written as a sum of positive squares in 4 ways, for example, as 1175056 + 108680625 = 1084^2 + 10425^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 109855681 - 2²⁵ = 76301249 is a prime.

It is a super-2 number, since 2×109855681² = 24136541295947522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109855621) 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 7 ways as a sum of consecutive naturals, for example, 13975 + ... + 20371.

It is an arithmetic number, because the mean of its divisors is an integer number (14801773).

Almost surely, 2^109855681 is an apocalyptic number.

It is an amenable number.

109855681 is a deficient number, since it is larger than the sum of its proper divisors (8558503).

109855681 is a wasteful number, since it uses less digits than its factorization.

109855681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7731.

The product of its (nonzero) digits is 86400, while the sum is 43.

The square root of 109855681 is about 10481.2060851793. The cubic root of 109855681 is about 478.9323506900.

The spelling of 109855681 in words is "one hundred nine million, eight hundred fifty-five thousand, six hundred eighty-one".