101028209 has 2 divisors, whose sum is σ = 101028210. Its totient is φ = 101028208.

The previous prime is 101028203. The next prime is 101028233. The reversal of 101028209 is 902820101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76177984 + 24850225 = 8728^2 + 4985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101028209 is a prime.

It is not a weakly prime, because it can be changed into another prime (101028203) 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, 50514104 + 50514105.

It is an arithmetic number, because the mean of its divisors is an integer number (50514105).

Almost surely, 2^101028209 is an apocalyptic number.

It is an amenable number.

101028209 is a deficient number, since it is larger than the sum of its proper divisors (1).

101028209 is an equidigital number, since it uses as much as digits as its factorization.

101028209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 101028209 is about 10051.2789733446. The cubic root of 101028209 is about 465.7443030420.

The spelling of 101028209 in words is "one hundred one million, twenty-eight thousand, two hundred nine".