120217309 has 2 divisors, whose sum is σ = 120217310. Its totient is φ = 120217308.

The previous prime is 120217277. The next prime is 120217333. The reversal of 120217309 is 903712021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111894084 + 8323225 = 10578^2 + 2885^2 .

It is a cyclic number.

It is not a de Polignac number, because 120217309 - 2⁵ = 120217277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120257309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60108654 + 60108655.

It is an arithmetic number, because the mean of its divisors is an integer number (60108655).

Almost surely, 2^120217309 is an apocalyptic number.

It is an amenable number.

120217309 is a deficient number, since it is larger than the sum of its proper divisors (1).

120217309 is an equidigital number, since it uses as much as digits as its factorization.

120217309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 120217309 is about 10964.3654171138. The cubic root of 120217309 is about 493.5399742539.

The spelling of 120217309 in words is "one hundred twenty million, two hundred seventeen thousand, three hundred nine".