120756809 has 2 divisors, whose sum is σ = 120756810. Its totient is φ = 120756808.

The previous prime is 120756803. The next prime is 120756817. The reversal of 120756809 is 908657021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120121600 + 635209 = 10960^2 + 797^2 .

It is a cyclic number.

It is not a de Polignac number, because 120756809 - 2²⁴ = 103979593 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 (120756803) 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, 60378404 + 60378405.

It is an arithmetic number, because the mean of its divisors is an integer number (60378405).

Almost surely, 2^120756809 is an apocalyptic number.

It is an amenable number.

120756809 is a deficient number, since it is larger than the sum of its proper divisors (1).

120756809 is an equidigital number, since it uses as much as digits as its factorization.

120756809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 120756809 is about 10988.9403037782. The cubic root of 120756809 is about 494.2771601114.

The spelling of 120756809 in words is "one hundred twenty million, seven hundred fifty-six thousand, eight hundred nine".