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643253 = 1349481
BaseRepresentation
bin10011101000010110101
31012200101012
42131002311
5131041003
621442005
75316242
oct2350265
91180335
10643253
113aa316
12270305
13196a30
1412a5c9
15ca8d8
hex9d0b5

643253 has 4 divisors (see below), whose sum is σ = 692748. Its totient is φ = 593760.

The previous prime is 643243. The next prime is 643273. The reversal of 643253 is 352346.

643253 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 91204 + 552049 = 302^2 + 743^2 .

It is a cyclic number.

It is not a de Polignac number, because 643253 - 28 = 642997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643213) 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, 24728 + ... + 24753.

It is an arithmetic number, because the mean of its divisors is an integer number (173187).

2643253 is an apocalyptic number.

It is an amenable number.

643253 is a deficient number, since it is larger than the sum of its proper divisors (49495).

643253 is a wasteful number, since it uses less digits than its factorization.

643253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49494.

The product of its digits is 2160, while the sum is 23.

The square root of 643253 is about 802.0305480466. The cubic root of 643253 is about 86.3231487549.

Adding to 643253 its reverse (352346), we get a palindrome (995599).

The spelling of 643253 in words is "six hundred forty-three thousand, two hundred fifty-three".

Divisors: 1 13 49481 643253