57317221 has 16 divisors (see below), whose sum is σ = 64456560. Its totient is φ = 50618880.

The previous prime is 57317179. The next prime is 57317231. The reversal of 57317221 is 12271375.

It can be written as a sum of positive squares in 8 ways, for example, as 12321 + 57304900 = 111^2 + 7570^2 .

It is not a de Polignac number, because 57317221 - 2⁹ = 57316709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57317221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57317231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27235 + ... + 29263.

It is an arithmetic number, because the mean of its divisors is an integer number (4028535).

Almost surely, 2^57317221 is an apocalyptic number.

It is an amenable number.

57317221 is a deficient number, since it is larger than the sum of its proper divisors (7139339).

57317221 is a wasteful number, since it uses less digits than its factorization.

57317221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136.

The product of its digits is 2940, while the sum is 28.

The square root of 57317221 is about 7570.8137607525. The cubic root of 57317221 is about 385.5627257642.

Adding to 57317221 its reverse (12271375), we get a palindrome (69588596).

The spelling of 57317221 in words is "fifty-seven million, three hundred seventeen thousand, two hundred twenty-one".