109543681 has 8 divisors (see below), whose sum is σ = 118056680. Its totient is φ = 101043072.

The previous prime is 109543673. The next prime is 109543751. The reversal of 109543681 is 186345901.

It can be written as a sum of positive squares in 4 ways, for example, as 4665600 + 104878081 = 2160^2 + 10241^2 .

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

It is not a de Polignac number, because 109543681 - 2³ = 109543673 is a prime.

It is a super-2 number, since 2×109543681² = 23999636094059522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 109543681.

It is not an unprimeable number, because it can be changed into a prime (109543481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24301 + ... + 28453.

It is an arithmetic number, because the mean of its divisors is an integer number (14757085).

Almost surely, 2^109543681 is an apocalyptic number.

It is an amenable number.

109543681 is a deficient number, since it is larger than the sum of its proper divisors (8512999).

109543681 is a wasteful number, since it uses less digits than its factorization.

109543681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6195.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 109543681 is about 10466.3117190346. The cubic root of 109543681 is about 478.4785171464.

It can be divided in two parts, 109543 and 681, that added together give a square (110224 = 332²).

The spelling of 109543681 in words is "one hundred nine million, five hundred forty-three thousand, six hundred eighty-one".