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6642217 = 12895153
BaseRepresentation
bin11001010101101000101001
3110111110102001
4121111220221
53200022332
6354211001
7110313031
oct31255051
913443361
106642217
11382743a
122283a61
1314b740a
14c4c8c1
158b30e7
hex655a29

6642217 has 4 divisors (see below), whose sum is σ = 6648660. Its totient is φ = 6635776.

The previous prime is 6642211. The next prime is 6642281. The reversal of 6642217 is 7122466.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4822416 + 1819801 = 2196^2 + 1349^2 .

It is a 3-Lehmer number, since φ(6642217) divides (6642217-1)3.

It is a cyclic number.

It is not a de Polignac number, because 6642217 - 27 = 6642089 is a prime.

It is a Duffinian number.

6642217 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6642211) 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 3 ways as a sum of consecutive naturals, for example, 1288 + ... + 3865.

It is an arithmetic number, because the mean of its divisors is an integer number (1662165).

Almost surely, 26642217 is an apocalyptic number.

6642217 is the 1289-th decagonal number.

It is an amenable number.

6642217 is a deficient number, since it is larger than the sum of its proper divisors (6443).

6642217 is a wasteful number, since it uses less digits than its factorization.

6642217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6442.

The product of its digits is 4032, while the sum is 28.

The square root of 6642217 is about 2577.2498908721. The cubic root of 6642217 is about 187.9768437603.

Subtracting 6642217 from its reverse (7122466), we obtain a square (480249 = 6932).

It can be divided in two parts, 6642 and 217, that added together give a cube (6859 = 193).

The spelling of 6642217 in words is "six million, six hundred forty-two thousand, two hundred seventeen".

Divisors: 1 1289 5153 6642217