43228161 has 20 divisors (see below), whose sum is σ = 68376132. Its totient is φ = 27122688.

The previous prime is 43228123. The next prime is 43228177. The reversal of 43228161 is 16182234.

It can be written as a sum of positive squares in 2 ways, for example, as 39690000 + 3538161 = 6300^2 + 1881^2 .

It is not a de Polignac number, because 43228161 - 2¹⁸ = 42966017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (43228121) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14320 + ... + 17073.

Almost surely, 2^43228161 is an apocalyptic number.

It is an amenable number.

43228161 is a deficient number, since it is larger than the sum of its proper divisors (25147971).

43228161 is a wasteful number, since it uses less digits than its factorization.

43228161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31422 (or 31413 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 43228161 is about 6574.8126209041. The cubic root of 43228161 is about 350.9583557869.

The spelling of 43228161 in words is "forty-three million, two hundred twenty-eight thousand, one hundred sixty-one".