53663521 has 4 divisors (see below), whose sum is σ = 53767044. Its totient is φ = 53560000.

The previous prime is 53663503. The next prime is 53663557. The reversal of 53663521 is 12536635.

53663521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7952400 + 45711121 = 2820^2 + 6761^2 .

It is a cyclic number.

It is not a de Polignac number, because 53663521 - 2²¹ = 51566369 is a prime.

It is a super-2 number, since 2×53663521² = 5759546972234882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53663221) 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 3 ways as a sum of consecutive naturals, for example, 50980 + ... + 52021.

It is an arithmetic number, because the mean of its divisors is an integer number (13441761).

Almost surely, 2^53663521 is an apocalyptic number.

It is an amenable number.

53663521 is a deficient number, since it is larger than the sum of its proper divisors (103523).

53663521 is a wasteful number, since it uses less digits than its factorization.

53663521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103522.

The product of its digits is 16200, while the sum is 31.

The square root of 53663521 is about 7325.5389562816. The cubic root of 53663521 is about 377.1896102166.

The spelling of 53663521 in words is "fifty-three million, six hundred sixty-three thousand, five hundred twenty-one".