57215 has 4 divisors (see below), whose sum is σ = 68664. Its totient is φ = 45768.

The previous prime is 57203. The next prime is 57221. The reversal of 57215 is 51275.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57215 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5717 + ... + 5726.

It is an arithmetic number, because the mean of its divisors is an integer number (17166).

2⁵⁷²¹⁵ is an apocalyptic number.

57215 is a deficient number, since it is larger than the sum of its proper divisors (11449).

57215 is a wasteful number, since it uses less digits than its factorization.

57215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11448.

The product of its digits is 350, while the sum is 20.

The square root of 57215 is about 239.1965718818. The cubic root of 57215 is about 38.5333381891.

Subtracting from 57215 its product of digits (350), we obtain a palindrome (56865).

It can be divided in two parts, 57 and 215, that added together give a palindrome (272).

The spelling of 57215 in words is "fifty-seven thousand, two hundred fifteen".