57209 has 4 divisors (see below), whose sum is σ = 60240. Its totient is φ = 54180.

The previous prime is 57203. The next prime is 57221. The reversal of 57209 is 90275.

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 a cyclic number.

It is not a de Polignac number, because 57209 - 2⁴ = 57193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (57203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1487 + ... + 1524.

It is an arithmetic number, because the mean of its divisors is an integer number (15060).

2⁵⁷²⁰⁹ is an apocalyptic number.

It is an amenable number.

57209 is a deficient number, since it is larger than the sum of its proper divisors (3031).

57209 is a wasteful number, since it uses less digits than its factorization.

57209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 57209 is about 239.1840295672. The cubic root of 57209 is about 38.5319911757.

The spelling of 57209 in words is "fifty-seven thousand, two hundred nine".