220009 has 2 divisors, whose sum is σ = 220010.
Its totient is φ = 220008.
The previous prime is 219983. The next prime is 220013. The reversal of 220009 is 900022.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 162409 + 57600 = 403^2 + 240^2
It is a cyclic number.
It is not a de Polignac number, because 220009 - 25 = 219977 is a prime.
It is a nialpdrome in base 8.
It is not a weakly prime, because it can be changed into another prime (220019) 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 as a sum of consecutive naturals, namely, 110004 + 110005.
It is an arithmetic number, because the mean of its divisors is an integer number (110005).
2220009 is an apocalyptic number.
It is an amenable number.
220009 is a deficient number, since it is larger than the sum of its proper divisors (1).
220009 is an equidigital number, since it uses as much as digits as its factorization.
220009 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 36, while the sum is 13.
The square root of 220009 is about 469.0511699165.
The cubic root of 220009 is about 60.3689305582.
Adding to 220009 its sum of digits (13), we get a palindrome (220022).
The spelling of 220009 in words is "two hundred twenty thousand, nine".