100220209 has 2 divisors, whose sum is σ = 100220210.
Its totient is φ = 100220208.
The previous prime is 100220203. The next prime is 100220213. The reversal of 100220209 is 902022001.
It is a happy number.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 93702400 + 6517809 = 9680^2 + 2553^2
It is a cyclic number.
It is not a de Polignac number, because 100220209 - 211 = 100218161 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 100220192 and 100220201.
It is not a weakly prime, because it can be changed into another prime (100220203) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50110104 + 50110105.
It is an arithmetic number, because the mean of its divisors is an integer number (50110105).
Almost surely, 2100220209 is an apocalyptic number.
It is an amenable number.
100220209 is a deficient number, since it is larger than the sum of its proper divisors (1).
100220209 is an equidigital number, since it uses as much as digits as its factorization.
100220209 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 72, while the sum is 16.
The square root of 100220209 is about 10011.0043951644.
The cubic root of 100220209 is about 464.4993401231.
The spelling of 100220209 in words is "one hundred million, two hundred twenty thousand, two hundred nine".