43681109 has 4 divisors (see below), whose sum is σ = 46250604. Its totient is φ = 41111616.

The previous prime is 43681103. The next prime is 43681123. The reversal of 43681109 is 90118634.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 31114084 + 12567025 = 5578^2 + 3545^2 .

It is a cyclic number.

It is not a de Polignac number, because 43681109 - 2²⁴ = 26903893 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 (43681103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1284722 + ... + 1284755.

It is an arithmetic number, because the mean of its divisors is an integer number (11562651).

Almost surely, 2^43681109 is an apocalyptic number.

It is an amenable number.

43681109 is a deficient number, since it is larger than the sum of its proper divisors (2569495).

43681109 is a wasteful number, since it uses less digits than its factorization.

43681109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2569494.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 43681109 is about 6609.1685558775. The cubic root of 43681109 is about 352.1798887904.

The spelling of 43681109 in words is "forty-three million, six hundred eighty-one thousand, one hundred nine".