120120809 has 2 divisors, whose sum is σ = 120120810. Its totient is φ = 120120808.

The previous prime is 120120799. The next prime is 120120821. The reversal of 120120809 is 908021021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78234025 + 41886784 = 8845^2 + 6472^2 .

It is an emirp because it is prime and its reverse (908021021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 120120809 - 2²⁴ = 103343593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (120120859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60060404 + 60060405.

It is an arithmetic number, because the mean of its divisors is an integer number (60060405).

Almost surely, 2^120120809 is an apocalyptic number.

It is an amenable number.

120120809 is a deficient number, since it is larger than the sum of its proper divisors (1).

120120809 is an equidigital number, since it uses as much as digits as its factorization.

120120809 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 120120809 is about 10959.9639141742. The cubic root of 120120809 is about 493.4078819146.

The spelling of 120120809 in words is "one hundred twenty million, one hundred twenty thousand, eight hundred nine".