100220129 has 2 divisors, whose sum is σ = 100220130.
Its totient is φ = 100220128.
The previous prime is 100220119. The next prime is 100220189. The reversal of 100220129 is 921022001.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 58553104 + 41667025 = 7652^2 + 6455^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-100220129 is a prime.
It is a Sophie Germain prime.
It is a Curzon number.
It is not a weakly prime, because it can be changed into another prime (100220119) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50110064 + 50110065.
It is an arithmetic number, because the mean of its divisors is an integer number (50110065).
Almost surely, 2100220129 is an apocalyptic number.
It is an amenable number.
100220129 is a deficient number, since it is larger than the sum of its proper divisors (1).
100220129 is an equidigital number, since it uses as much as digits as its factorization.
100220129 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 17.
The square root of 100220129 is about 10011.0003995605.
Note that the first 3 decimals coincide.
The cubic root of 100220129 is about 464.4992165288.
The spelling of 100220129 in words is "one hundred million, two hundred twenty thousand, one hundred twenty-nine".