43081521 has 16 divisors (see below), whose sum is σ = 66124800. Its totient is φ = 24439248.

The previous prime is 43081499. The next prime is 43081523. The reversal of 43081521 is 12518034.

43081521 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 43081521 - 2⁷ = 43081393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43081491 and 43081500.

It is not an unprimeable number, because it can be changed into a prime (43081523) 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 15 ways as a sum of consecutive naturals, for example, 4461 + ... + 10298.

It is an arithmetic number, because the mean of its divisors is an integer number (4132800).

Almost surely, 2^43081521 is an apocalyptic number.

It is an amenable number.

43081521 is a deficient number, since it is larger than the sum of its proper divisors (23043279).

43081521 is a wasteful number, since it uses less digits than its factorization.

43081521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14908.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 43081521 is about 6563.6514989752. The cubic root of 43081521 is about 350.5610620225.

Adding to 43081521 its reverse (12518034), we get a palindrome (55599555).

The spelling of 43081521 in words is "forty-three million, eighty-one thousand, five hundred twenty-one".