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31447 = 134159
BaseRepresentation
bin111101011010111
31121010201
413223113
52001242
6401331
7160453
oct75327
947121
1031447
1121699
1216247
1311410
14b663
1594b7

31447 has 8 divisors (see below), whose sum is σ = 35280. Its totient is φ = 27840.

The previous prime is 31397. The next prime is 31469. The reversal of 31447 is 74413.

It is a happy number.

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 31447 - 27 = 31319 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504 + ... + 562.

It is an arithmetic number, because the mean of its divisors is an integer number (4410).

231447 is an apocalyptic number.

31447 is a deficient number, since it is larger than the sum of its proper divisors (3833).

31447 is a wasteful number, since it uses less digits than its factorization.

31447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113.

The product of its digits is 336, while the sum is 19.

The square root of 31447 is about 177.3330200498. Note that the first 3 decimals coincide. The cubic root of 31447 is about 31.5640755022.

It can be divided in two parts, 314 and 47, that added together give a square (361 = 192).

The spelling of 31447 in words is "thirty-one thousand, four hundred forty-seven".

Divisors: 1 13 41 59 533 767 2419 31447