57509521 has 8 divisors (see below), whose sum is σ = 60959304. Its totient is φ = 54067200.

The previous prime is 57509509. The next prime is 57509539. The reversal of 57509521 is 12590575.

57509521 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 14737921 + 42771600 = 3839^2 + 6540^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 57509521 - 2⁵ = 57509489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57509321) 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 7 ways as a sum of consecutive naturals, for example, 26161 + ... + 28273.

It is an arithmetic number, because the mean of its divisors is an integer number (7619913).

Almost surely, 2^57509521 is an apocalyptic number.

It is an amenable number.

57509521 is a deficient number, since it is larger than the sum of its proper divisors (3449783).

57509521 is a wasteful number, since it uses less digits than its factorization.

57509521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3731.

The product of its (nonzero) digits is 15750, while the sum is 34.

The square root of 57509521 is about 7583.5032142144. The cubic root of 57509521 is about 385.9934337165.

The spelling of 57509521 in words is "fifty-seven million, five hundred nine thousand, five hundred twenty-one".