120320309 has 2 divisors, whose sum is σ = 120320310. Its totient is φ = 120320308.

The previous prime is 120320303. The next prime is 120320353. The reversal of 120320309 is 903023021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119290084 + 1030225 = 10922^2 + 1015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120320309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120320303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60160154 + 60160155.

It is an arithmetic number, because the mean of its divisors is an integer number (60160155).

Almost surely, 2^120320309 is an apocalyptic number.

It is an amenable number.

120320309 is a deficient number, since it is larger than the sum of its proper divisors (1).

120320309 is an equidigital number, since it uses as much as digits as its factorization.

120320309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 120320309 is about 10969.0614457209. The cubic root of 120320309 is about 493.6808860372.

It can be divided in two parts, 1203 and 20309, that added together give a palindrome (21512).

The spelling of 120320309 in words is "one hundred twenty million, three hundred twenty thousand, three hundred nine".