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57217 = 291973
BaseRepresentation
bin1101111110000001
32220111011
431332001
53312332
61120521
7325546
oct157601
986434
1057217
1139a96
1229141
1320074
1416bcd
1511e47
hexdf81

57217 has 4 divisors (see below), whose sum is σ = 59220. Its totient is φ = 55216.

The previous prime is 57203. The next prime is 57221. The reversal of 57217 is 71275.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20736 + 36481 = 144^2 + 191^2 .

It is not a de Polignac number, because 57217 - 27 = 57089 is a prime.

It is a Duffinian number.

57217 is a lucky number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (57287) 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, 958 + ... + 1015.

It is an arithmetic number, because the mean of its divisors is an integer number (14805).

257217 is an apocalyptic number.

It is an amenable number.

57217 is a deficient number, since it is larger than the sum of its proper divisors (2003).

57217 is a wasteful number, since it uses less digits than its factorization.

57217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002.

The product of its digits is 490, while the sum is 22.

The square root of 57217 is about 239.2007525072. The cubic root of 57217 is about 38.5337871726.

The spelling of 57217 in words is "fifty-seven thousand, two hundred seventeen".

Divisors: 1 29 1973 57217