320231309 has 2 divisors, whose sum is σ = 320231310. Its totient is φ = 320231308.

The previous prime is 320231299. The next prime is 320231321. The reversal of 320231309 is 903132023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 263153284 + 57078025 = 16222^2 + 7555^2 .

It is a cyclic number.

It is not a de Polignac number, because 320231309 - 2⁴ = 320231293 is a prime.

It is a super-4 number, since 4×320231309⁴ (a number of 35 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320231399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160115654 + 160115655.

It is an arithmetic number, because the mean of its divisors is an integer number (160115655).

Almost surely, 2^320231309 is an apocalyptic number.

It is an amenable number.

320231309 is a deficient number, since it is larger than the sum of its proper divisors (1).

320231309 is an equidigital number, since it uses as much as digits as its factorization.

320231309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 320231309 is about 17895.0079351757. The cubic root of 320231309 is about 684.1551443216.

The spelling of 320231309 in words is "three hundred twenty million, two hundred thirty-one thousand, three hundred nine".