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31217 = 193153
BaseRepresentation
bin111100111110001
31120211012
413213301
51444332
6400305
7160004
oct74761
946735
1031217
11214aa
1216095
1311294
14b53b
1593b2
hex79f1

31217 has 8 divisors (see below), whose sum is σ = 34560. Its totient is φ = 28080.

The previous prime is 31193. The next prime is 31219. The reversal of 31217 is 71213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31217 - 26 = 31153 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 31217.

It is not an unprimeable number, because it can be changed into a prime (31219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 563 + ... + 615.

It is an arithmetic number, because the mean of its divisors is an integer number (4320).

231217 is an apocalyptic number.

It is an amenable number.

31217 is a deficient number, since it is larger than the sum of its proper divisors (3343).

31217 is a wasteful number, since it uses less digits than its factorization.

31217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103.

The product of its digits is 42, while the sum is 14.

The square root of 31217 is about 176.6833325472. The cubic root of 31217 is about 31.4869350371.

The spelling of 31217 in words is "thirty-one thousand, two hundred seventeen".

Divisors: 1 19 31 53 589 1007 1643 31217