320623969 has 2 divisors, whose sum is σ = 320623970. Its totient is φ = 320623968.

The previous prime is 320623939. The next prime is 320623973. The reversal of 320623969 is 969326023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 286049569 + 34574400 = 16913^2 + 5880^2 .

It is an emirp because it is prime and its reverse (969326023) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320623969 is a prime.

It is a super-2 number, since 2×320623969² = 205599458994625922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (320623939) 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, 160311984 + 160311985.

It is an arithmetic number, because the mean of its divisors is an integer number (160311985).

Almost surely, 2^320623969 is an apocalyptic number.

It is an amenable number.

320623969 is a deficient number, since it is larger than the sum of its proper divisors (1).

320623969 is an equidigital number, since it uses as much as digits as its factorization.

320623969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 40.

The square root of 320623969 is about 17905.9757902215. The cubic root of 320623969 is about 684.4346616850.

The spelling of 320623969 in words is "three hundred twenty million, six hundred twenty-three thousand, nine hundred sixty-nine".