43643121 has 16 divisors (see below), whose sum is σ = 61722240. Its totient is φ = 27371520.

The previous prime is 43643111. The next prime is 43643129. The reversal of 43643121 is 12134634.

It is a de Polignac number, because none of the positive numbers 2^k-43643121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43643091 and 43643100.

It is not an unprimeable number, because it can be changed into a prime (43643129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 976 + ... + 9393.

It is an arithmetic number, because the mean of its divisors is an integer number (3857640).

Almost surely, 2^43643121 is an apocalyptic number.

It is an amenable number.

43643121 is a deficient number, since it is larger than the sum of its proper divisors (18079119).

43643121 is a wasteful number, since it uses less digits than its factorization.

43643121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10456.

The product of its digits is 1728, while the sum is 24.

The square root of 43643121 is about 6606.2940443186. The cubic root of 43643121 is about 352.0777661558.

Adding to 43643121 its reverse (12134634), we get a palindrome (55777755).

The spelling of 43643121 in words is "forty-three million, six hundred forty-three thousand, one hundred twenty-one".