53505621 has 24 divisors (see below), whose sum is σ = 83636280. Its totient is φ = 32766336.

The previous prime is 53505607. The next prime is 53505649. The reversal of 53505621 is 12650535.

53505621 is a `hidden beast` number, since 5 + 35 + 0 + 5 + 621 = 666.

53505621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1102500 + 52403121 = 1050^2 + 7239^2 .

It is not a de Polignac number, because 53505621 - 2¹⁰ = 53504597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53504621) 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 23 ways as a sum of consecutive naturals, for example, 25795 + ... + 27791.

It is an arithmetic number, because the mean of its divisors is an integer number (3484845).

Almost surely, 2^53505621 is an apocalyptic number.

It is an amenable number.

53505621 is a deficient number, since it is larger than the sum of its proper divisors (30130659).

53505621 is a wasteful number, since it uses less digits than its factorization.

53505621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245 (or 2242 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 53505621 is about 7314.7536527213. The cubic root of 53505621 is about 376.8192981380.

The spelling of 53505621 in words is "fifty-three million, five hundred five thousand, six hundred twenty-one".