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663531 = 31120107
BaseRepresentation
bin10100001111111101011
31020201012020
42201333223
5132213111
622115523
75432331
oct2417753
91221166
10663531
11413580
1227bba3
131a302b
14133b51
15d1906
hexa1feb

663531 has 8 divisors (see below), whose sum is σ = 965184. Its totient is φ = 402120.

The previous prime is 663529. The next prime is 663539. The reversal of 663531 is 135366.

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

It is not a de Polignac number, because 663531 - 21 = 663529 is a prime.

It is a super-2 number, since 2×6635312 = 880546775922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (663539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10021 + ... + 10086.

It is an arithmetic number, because the mean of its divisors is an integer number (120648).

2663531 is an apocalyptic number.

663531 is a deficient number, since it is larger than the sum of its proper divisors (301653).

663531 is a wasteful number, since it uses less digits than its factorization.

663531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20121.

The product of its digits is 1620, while the sum is 24.

The square root of 663531 is about 814.5741218576. The cubic root of 663531 is about 87.2208683186.

Adding to 663531 its reverse (135366), we get a palindrome (798897).

It can be divided in two parts, 6635 and 31, that added together give a palindrome (6666).

The spelling of 663531 in words is "six hundred sixty-three thousand, five hundred thirty-one".

Divisors: 1 3 11 33 20107 60321 221177 663531