43109 has 4 divisors (see below), whose sum is σ = 47040. Its totient is φ = 39180.

The previous prime is 43103. The next prime is 43117. The reversal of 43109 is 90134.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43109 - 2⁴ = 43093 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1949 + ... + 1970.

It is an arithmetic number, because the mean of its divisors is an integer number (11760).

2⁴³¹⁰⁹ is an apocalyptic number.

It is an amenable number.

43109 is a deficient number, since it is larger than the sum of its proper divisors (3931).

43109 is a wasteful number, since it uses less digits than its factorization.

43109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3930.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 43109 is about 207.6270695261. The cubic root of 43109 is about 35.0635579819.

It can be divided in two parts, 4 and 3109, that added together give a palindrome (3113).

The spelling of 43109 in words is "forty-three thousand, one hundred nine".