43722161 has 12 divisors (see below), whose sum is σ = 51360192. Its totient is φ = 37108008.

The previous prime is 43722139. The next prime is 43722187. The reversal of 43722161 is 16122734.

43722161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 43722161 - 2¹⁴ = 43705777 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43722161.

It is not an unprimeable number, because it can be changed into a prime (43722101) 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, 716 + ... + 9378.

It is an arithmetic number, because the mean of its divisors is an integer number (4280016).

Almost surely, 2^43722161 is an apocalyptic number.

It is an amenable number.

43722161 is a deficient number, since it is larger than the sum of its proper divisors (7638031).

43722161 is a wasteful number, since it uses less digits than its factorization.

43722161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8780 (or 8773 counting only the distinct ones).

The product of its digits is 2016, while the sum is 26.

The square root of 43722161 is about 6612.2735121893. The cubic root of 43722161 is about 352.2901817929.

Adding to 43722161 its reverse (16122734), we get a palindrome (59844895).

The spelling of 43722161 in words is "forty-three million, seven hundred twenty-two thousand, one hundred sixty-one".