320624009 has 2 divisors, whose sum is σ = 320624010. Its totient is φ = 320624008.

The previous prime is 320623973. The next prime is 320624027. The reversal of 320624009 is 900426023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 309865609 + 10758400 = 17603^2 + 3280^2 .

It is a cyclic number.

It is not a de Polignac number, because 320624009 - 2⁸ = 320623753 is a prime.

It is not a weakly prime, because it can be changed into another prime (320624509) 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 as a sum of consecutive naturals, namely, 160312004 + 160312005.

It is an arithmetic number, because the mean of its divisors is an integer number (160312005).

Almost surely, 2^320624009 is an apocalyptic number.

It is an amenable number.

320624009 is a deficient number, since it is larger than the sum of its proper divisors (1).

320624009 is an equidigital number, since it uses as much as digits as its factorization.

320624009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 320624009 is about 17905.9769071671. The cubic root of 320624009 is about 684.4346901476.

The spelling of 320624009 in words is "three hundred twenty million, six hundred twenty-four thousand, nine".