43161209 has 12 divisors (see below), whose sum is σ = 54070884. Its totient is φ = 34149024.

The previous prime is 43161197. The next prime is 43161211. The reversal of 43161209 is 90216134.

43161209 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 2 ways, for example, as 25755625 + 17405584 = 5075^2 + 4172^2 .

It is not a de Polignac number, because 43161209 - 2²⁴ = 26383993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43161229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33242 + ... + 34515.

It is an arithmetic number, because the mean of its divisors is an integer number (4505907).

Almost surely, 2^43161209 is an apocalyptic number.

43161209 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

43161209 is a deficient number, since it is larger than the sum of its proper divisors (10909675).

43161209 is a wasteful number, since it uses less digits than its factorization.

43161209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67784 (or 67777 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 43161209 is about 6569.7190959736. The cubic root of 43161209 is about 350.7770734570. Note that the first 3 decimals are identical.

The spelling of 43161209 in words is "forty-three million, one hundred sixty-one thousand, two hundred nine".