43168009 has 4 divisors (see below), whose sum is σ = 43186500. Its totient is φ = 43149520.

The previous prime is 43168003. The next prime is 43168061. The reversal of 43168009 is 90086134.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90086134 = 2 ⋅45043067.

It can be written as a sum of positive squares in 2 ways, for example, as 5382400 + 37785609 = 2320^2 + 6147^2 .

It is a cyclic number.

It is not a de Polignac number, because 43168009 - 2⁵ = 43167977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43168003) 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, 5134 + ... + 10615.

It is an arithmetic number, because the mean of its divisors is an integer number (10796625).

Almost surely, 2^43168009 is an apocalyptic number.

It is an amenable number.

43168009 is a deficient number, since it is larger than the sum of its proper divisors (18491).

43168009 is a wasteful number, since it uses less digits than its factorization.

43168009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18490.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 43168009 is about 6570.2366015236. The cubic root of 43168009 is about 350.7954940010.

The spelling of 43168009 in words is "forty-three million, one hundred sixty-eight thousand, nine".