43055521 has 4 divisors (see below), whose sum is σ = 43128000. Its totient is φ = 42983044.

The previous prime is 43055491. The next prime is 43055561. The reversal of 43055521 is 12555034.

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.

It is a cyclic number.

It is not a de Polignac number, because 43055521 - 2⁵ = 43055489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43055561) 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, 35341 + ... + 36538.

It is an arithmetic number, because the mean of its divisors is an integer number (10782000).

Almost surely, 2^43055521 is an apocalyptic number.

It is an amenable number.

43055521 is a deficient number, since it is larger than the sum of its proper divisors (72479).

43055521 is an equidigital number, since it uses as much as digits as its factorization.

43055521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72478.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 43055521 is about 6561.6705952067. The cubic root of 43055521 is about 350.4905258112.

The spelling of 43055521 in words is "forty-three million, fifty-five thousand, five hundred twenty-one".