320423209 has 2 divisors, whose sum is σ = 320423210. Its totient is φ = 320423208.

The previous prime is 320423183. The next prime is 320423251. The reversal of 320423209 is 902324023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172265625 + 148157584 = 13125^2 + 12172^2 .

It is a cyclic number.

It is not a de Polignac number, because 320423209 - 2¹¹ = 320421161 is a prime.

It is not a weakly prime, because it can be changed into another prime (320423269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160211604 + 160211605.

It is an arithmetic number, because the mean of its divisors is an integer number (160211605).

Almost surely, 2^320423209 is an apocalyptic number.

It is an amenable number.

320423209 is a deficient number, since it is larger than the sum of its proper divisors (1).

320423209 is an equidigital number, since it uses as much as digits as its factorization.

320423209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 320423209 is about 17900.3689626778. The cubic root of 320423209 is about 684.2917780110.

The spelling of 320423209 in words is "three hundred twenty million, four hundred twenty-three thousand, two hundred nine".