57201521 has 8 divisors (see below), whose sum is σ = 61690944. Its totient is φ = 52724880.

The previous prime is 57201517. The next prime is 57201523. The reversal of 57201521 is 12510275.

It is a happy number.

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

It is not a de Polignac number, because 57201521 - 2² = 57201517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57201523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7436 + ... + 13026.

It is an arithmetic number, because the mean of its divisors is an integer number (7711368).

Almost surely, 2^57201521 is an apocalyptic number.

It is an amenable number.

57201521 is a deficient number, since it is larger than the sum of its proper divisors (4489423).

57201521 is a wasteful number, since it uses less digits than its factorization.

57201521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6391.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 57201521 is about 7563.1687142361. The cubic root of 57201521 is about 385.3031199164.

Adding to 57201521 its reverse (12510275), we get a palindrome (69711796).

The spelling of 57201521 in words is "fifty-seven million, two hundred one thousand, five hundred twenty-one".