43109109 has 24 divisors (see below), whose sum is σ = 64740000. Its totient is φ = 27609120.

The previous prime is 43109089. The next prime is 43109111. The reversal of 43109109 is 90190134.

It is not a de Polignac number, because 43109109 - 2¹⁷ = 42978037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43109159) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86142 + ... + 86640.

It is an arithmetic number, because the mean of its divisors is an integer number (2697500).

Almost surely, 2^43109109 is an apocalyptic number.

It is an amenable number.

43109109 is a deficient number, since it is larger than the sum of its proper divisors (21630891).

43109109 is a wasteful number, since it uses less digits than its factorization.

43109109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865 (or 862 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 43109109 is about 6565.7527367393. The cubic root of 43109109 is about 350.6358753430.

The spelling of 43109109 in words is "forty-three million, one hundred nine thousand, one hundred nine".