43053521 has 4 divisors (see below), whose sum is σ = 49204032. Its totient is φ = 36903012.

The previous prime is 43053509. The next prime is 43053553. The reversal of 43053521 is 12535034.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12535034 = 2 ⋅6267517.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43053521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43053121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3075245 + ... + 3075258.

It is an arithmetic number, because the mean of its divisors is an integer number (12301008).

Almost surely, 2^43053521 is an apocalyptic number.

It is an amenable number.

43053521 is a deficient number, since it is larger than the sum of its proper divisors (6150511).

43053521 is an equidigital number, since it uses as much as digits as its factorization.

43053521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6150510.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 43053521 is about 6561.5181932233. The cubic root of 43053521 is about 350.4850987728.

Adding to 43053521 its reverse (12535034), we get a palindrome (55588555).

The spelling of 43053521 in words is "forty-three million, fifty-three thousand, five hundred twenty-one".