43478309609 has 6 divisors (see below), whose sum is σ = 50576809194. Its totient is φ = 37267122480.

The previous prime is 43478309603. The next prime is 43478309669. The reversal of 43478309609 is 90690387434.

43478309609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 43429309609 + 49000000 = 208397^2 + 7000^2 .

It is not a de Polignac number, because 43478309609 - 2⁴ = 43478309593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43478309603) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 443656172 + ... + 443656269.

It is an arithmetic number, because the mean of its divisors is an integer number (8429468199).

Almost surely, 2^43478309609 is an apocalyptic number.

43478309609 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

43478309609 is a deficient number, since it is larger than the sum of its proper divisors (7098499585).

43478309609 is an equidigital number, since it uses as much as digits as its factorization.

43478309609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887312455 (or 887312448 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 53.

The spelling of 43478309609 in words is "forty-three billion, four hundred seventy-eight million, three hundred nine thousand, six hundred nine".