120689209 has 2 divisors, whose sum is σ = 120689210. Its totient is φ = 120689208.

The previous prime is 120689207. The next prime is 120689237. The reversal of 120689209 is 902986021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62853184 + 57836025 = 7928^2 + 7605^2 .

It is a cyclic number.

It is not a de Polignac number, because 120689209 - 2¹ = 120689207 is a prime.

Together with 120689207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (120689207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60344604 + 60344605.

It is an arithmetic number, because the mean of its divisors is an integer number (60344605).

Almost surely, 2^120689209 is an apocalyptic number.

It is an amenable number.

120689209 is a deficient number, since it is larger than the sum of its proper divisors (1).

120689209 is an equidigital number, since it uses as much as digits as its factorization.

120689209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 120689209 is about 10985.8640534097. The cubic root of 120689209 is about 494.1849103157.

The spelling of 120689209 in words is "one hundred twenty million, six hundred eighty-nine thousand, two hundred nine".