43118821 has 4 divisors (see below), whose sum is σ = 43134444. Its totient is φ = 43103200.

The previous prime is 43118791. The next prime is 43118849. The reversal of 43118821 is 12881134.

43118821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33477796 + 9641025 = 5786^2 + 3105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43118821 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 43118821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43118221) 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 3 ways as a sum of consecutive naturals, for example, 2440 + ... + 9601.

It is an arithmetic number, because the mean of its divisors is an integer number (10783611).

Almost surely, 2^43118821 is an apocalyptic number.

It is an amenable number.

43118821 is a deficient number, since it is larger than the sum of its proper divisors (15623).

43118821 is a wasteful number, since it uses less digits than its factorization.

43118821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15622.

The product of its digits is 1536, while the sum is 28.

The square root of 43118821 is about 6566.4922904089. The cubic root of 43118821 is about 350.6622048126.

Adding to 43118821 its reverse (12881134), we get a palindrome (55999955).

The spelling of 43118821 in words is "forty-three million, one hundred eighteen thousand, eight hundred twenty-one".