57513221 has 4 divisors (see below), whose sum is σ = 57618912. Its totient is φ = 57407532.

The previous prime is 57513191. The next prime is 57513251. The reversal of 57513221 is 12231575.

57513221 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (57513191) and next prime (57513251).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57513221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57513251) 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, 52025 + ... + 53118.

It is an arithmetic number, because the mean of its divisors is an integer number (14404728).

Almost surely, 2^57513221 is an apocalyptic number.

It is an amenable number.

57513221 is a deficient number, since it is larger than the sum of its proper divisors (105691).

57513221 is a wasteful number, since it uses less digits than its factorization.

57513221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105690.

The product of its digits is 2100, while the sum is 26.

The square root of 57513221 is about 7583.7471608698. The cubic root of 57513221 is about 386.0017114478.

Adding to 57513221 its reverse (12231575), we get a palindrome (69744796).

The spelling of 57513221 in words is "fifty-seven million, five hundred thirteen thousand, two hundred twenty-one".