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BaseRepresentation
bin110101101101100001
3102011210012
4311231201
524020001
64414305
71604255
oct655541
9364705
10220001
11140321
12a7395
13791a2
145a265
15452bb
hex35b61

220001 has 4 divisors (see below), whose sum is σ = 231600. Its totient is φ = 208404.

The previous prime is 219983. The next prime is 220009. The reversal of 220001 is 100022.

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 220001 - 26 = 219937 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (220009) 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, 5771 + ... + 5808.

It is an arithmetic number, because the mean of its divisors is an integer number (57900).

2220001 is an apocalyptic number.

It is an amenable number.

220001 is a deficient number, since it is larger than the sum of its proper divisors (11599).

220001 is a wasteful number, since it uses less digits than its factorization.

220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11598.

The product of its (nonzero) digits is 4, while the sum is 5.

The square root of 220001 is about 469.0426419847. The cubic root of 220001 is about 60.3681988347.

Adding to 220001 its reverse (100022), we get a palindrome (320023).

Multiplying 220001 by its reverse (100022), we get a palindrome (22004940022).

The spelling of 220001 in words is "two hundred twenty thousand, one", and thus it is an iban number.

Divisors: 1 19 11579 220001