53580721 has 4 divisors (see below), whose sum is σ = 54591732. Its totient is φ = 52569712.

The previous prime is 53580701. The next prime is 53580739. The reversal of 53580721 is 12708535.

53580721 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 30913600 + 22667121 = 5560^2 + 4761^2 .

It is a cyclic number.

It is not a de Polignac number, because 53580721 - 2¹¹ = 53578673 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53580701) 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, 505426 + ... + 505531.

It is an arithmetic number, because the mean of its divisors is an integer number (13647933).

Almost surely, 2^53580721 is an apocalyptic number.

It is an amenable number.

53580721 is a deficient number, since it is larger than the sum of its proper divisors (1011011).

53580721 is a wasteful number, since it uses less digits than its factorization.

53580721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011010.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 53580721 is about 7319.8853133092. The cubic root of 53580721 is about 376.9955157574.

The spelling of 53580721 in words is "fifty-three million, five hundred eighty thousand, seven hundred twenty-one".