120009209 has 2 divisors, whose sum is σ = 120009210. Its totient is φ = 120009208.

The previous prime is 120009191. The next prime is 120009217. The reversal of 120009209 is 902900021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105781225 + 14227984 = 10285^2 + 3772^2 .

It is a cyclic number.

It is not a de Polignac number, because 120009209 - 2¹² = 120005113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (120009229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60004604 + 60004605.

It is an arithmetic number, because the mean of its divisors is an integer number (60004605).

Almost surely, 2^120009209 is an apocalyptic number.

It is an amenable number.

120009209 is a deficient number, since it is larger than the sum of its proper divisors (1).

120009209 is an equidigital number, since it uses as much as digits as its factorization.

120009209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 120009209 is about 10954.8714734587. The cubic root of 120009209 is about 493.2550319583.

The spelling of 120009209 in words is "one hundred twenty million, nine thousand, two hundred nine".