120115309 has 4 divisors (see below), whose sum is σ = 120640060. Its totient is φ = 119590560.

The previous prime is 120115301. The next prime is 120115339. The reversal of 120115309 is 903511021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 903511021 = 7 ⋅129073003.

It can be written as a sum of positive squares in 2 ways, for example, as 79602084 + 40513225 = 8922^2 + 6365^2 .

It is a cyclic number.

It is not a de Polignac number, because 120115309 - 2³ = 120115301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 120115309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120115301) 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 in 3 ways as a sum of consecutive naturals, for example, 262032 + ... + 262489.

It is an arithmetic number, because the mean of its divisors is an integer number (30160015).

Almost surely, 2^120115309 is an apocalyptic number.

It is an amenable number.

120115309 is a deficient number, since it is larger than the sum of its proper divisors (524751).

120115309 is an equidigital number, since it uses as much as digits as its factorization.

120115309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524750.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 120115309 is about 10959.7129980671. The cubic root of 120115309 is about 493.4003512050.

The spelling of 120115309 in words is "one hundred twenty million, one hundred fifteen thousand, three hundred nine".