57521 has 4 divisors (see below), whose sum is σ = 58212. Its totient is φ = 56832.

The previous prime is 57503. The next prime is 57527. The reversal of 57521 is 12575.

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 30625 + 26896 = 175^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 57521 - 2⁶ = 57457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 57493 and 57502.

It is not an unprimeable number, because it can be changed into a prime (57527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200 + ... + 393.

It is an arithmetic number, because the mean of its divisors is an integer number (14553).

2⁵⁷⁵²¹ is an apocalyptic number.

It is an amenable number.

57521 is a deficient number, since it is larger than the sum of its proper divisors (691).

57521 is an equidigital number, since it uses as much as digits as its factorization.

57521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690.

The product of its digits is 350, while the sum is 20.

The square root of 57521 is about 239.8353601953. The cubic root of 57521 is about 38.6019113661.

The spelling of 57521 in words is "fifty-seven thousand, five hundred twenty-one".