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6533 = 47139

6533 has 4 divisors (see below), whose sum is σ = 6720. Its totient is φ = 6348.

The previous prime is 6529. The next prime is 6547. The reversal of 6533 is 3356.

Adding to 6533 its reverse (3356), we get a palindrome (9889).

It can be divided in two parts, 653 and 3, that added together give a palindrome (656).

It is a happy number.

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 6533 - 22 = 6529 is a prime.

It is a deceptive number, since it divides R6532.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6553) 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, 23 + ... + 116.

It is an arithmetic number, because the mean of its divisors is an integer number (1680).

26533 is an apocalyptic number.

6533 is the 47-th octagonal number.

It is an amenable number.

6533 is a deficient number, since it is larger than the sum of its proper divisors (187).

6533 is a wasteful number, since it uses less digits than its factorization.

6533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186.

The product of its digits is 270, while the sum is 17.

The square root of 6533 is about 80.8269756950. The cubic root of 6533 is about 18.6940852732.

The spelling of 6533 in words is "six thousand, five hundred thirty-three".

Divisors: 1 47 139 6533