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663231 = 3221077
BaseRepresentation
bin10100001111010111111
31020200210010
42201322333
5132210411
622114303
75431422
oct2417277
91220703
10663231
11413328
1227b993
131a2b5a
141339b9
15d17a6
hexa1ebf

663231 has 4 divisors (see below), whose sum is σ = 884312. Its totient is φ = 442152.

The previous prime is 663209. The next prime is 663239. The reversal of 663231 is 132366.

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

It is not a de Polignac number, because 663231 - 26 = 663167 is a prime.

It is a super-2 number, since 2×6632312 = 879750718722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 663198 and 663207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663239) 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 3 ways as a sum of consecutive naturals, for example, 110536 + ... + 110541.

It is an arithmetic number, because the mean of its divisors is an integer number (221078).

2663231 is an apocalyptic number.

663231 is a deficient number, since it is larger than the sum of its proper divisors (221081).

663231 is a wasteful number, since it uses less digits than its factorization.

663231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221080.

The product of its digits is 648, while the sum is 21.

The square root of 663231 is about 814.3899557337. The cubic root of 663231 is about 87.2077213795.

Adding to 663231 its reverse (132366), we get a palindrome (795597).

The spelling of 663231 in words is "six hundred sixty-three thousand, two hundred thirty-one".

Divisors: 1 3 221077 663231