57117321 has 12 divisors (see below), whose sum is σ = 82568772. Its totient is φ = 38047776.

The previous prime is 57117301. The next prime is 57117329. The reversal of 57117321 is 12371175.

It is a happy number.

57117321 is a `hidden beast` number, since 571 + 1 + 73 + 21 = 666.

57117321 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 2 ways, for example, as 20575296 + 36542025 = 4536^2 + 6045^2 .

It is not a de Polignac number, because 57117321 - 2⁹ = 57116809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57117329) 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 11 ways as a sum of consecutive naturals, for example, 18715 + ... + 21551.

It is an arithmetic number, because the mean of its divisors is an integer number (6880731).

Almost surely, 2^57117321 is an apocalyptic number.

It is an amenable number.

57117321 is a deficient number, since it is larger than the sum of its proper divisors (25451451).

57117321 is a wasteful number, since it uses less digits than its factorization.

57117321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5080 (or 5077 counting only the distinct ones).

The product of its digits is 1470, while the sum is 27.

The square root of 57117321 is about 7557.6002143538. The cubic root of 57117321 is about 385.1139731157.

Adding to 57117321 its reverse (12371175), we get a palindrome (69488496).

The spelling of 57117321 in words is "fifty-seven million, one hundred seventeen thousand, three hundred twenty-one".