53005521 has 8 divisors (see below), whose sum is σ = 71009824. Its totient is φ = 35169120.

The previous prime is 53005517. The next prime is 53005531. The reversal of 53005521 is 12550035.

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

It is not a de Polignac number, because 53005521 - 2² = 53005517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53005531) 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, 41236 + ... + 42501.

It is an arithmetic number, because the mean of its divisors is an integer number (8876228).

Almost surely, 2^53005521 is an apocalyptic number.

It is an amenable number.

53005521 is a deficient number, since it is larger than the sum of its proper divisors (18004303).

53005521 is a wasteful number, since it uses less digits than its factorization.

53005521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83951.

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 53005521 is about 7280.4890632429. The cubic root of 53005521 is about 375.6416180218.

Adding to 53005521 its reverse (12550035), we get a palindrome (65555556).

The spelling of 53005521 in words is "fifty-three million, five thousand, five hundred twenty-one".