43520521 has 8 divisors (see below), whose sum is σ = 47608704. Its totient is φ = 39454320.

The previous prime is 43520513. The next prime is 43520537. The reversal of 43520521 is 12502534.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43520521 - 2³ = 43520513 is a prime.

It is a super-2 number, since 2×43520521² = 3788071496222882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43520492 and 43520501.

It is not an unprimeable number, because it can be changed into a prime (43520501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1201 + ... + 9406.

It is an arithmetic number, because the mean of its divisors is an integer number (5951088).

Almost surely, 2^43520521 is an apocalyptic number.

It is an amenable number.

43520521 is a deficient number, since it is larger than the sum of its proper divisors (4088183).

43520521 is a wasteful number, since it uses less digits than its factorization.

43520521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10991.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 43520521 is about 6597.0084887015. The cubic root of 43520521 is about 351.7477774118.

The spelling of 43520521 in words is "forty-three million, five hundred twenty thousand, five hundred twenty-one".