320663243 has 2 divisors, whose sum is σ = 320663244. Its totient is φ = 320663242.

The previous prime is 320663191. The next prime is 320663249. The reversal of 320663243 is 342366023.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 320663243 - 2¹² = 320659147 is a prime.

It is a super-2 number, since 2×320663243² = 205649830822554098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (320663249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160331621 + 160331622.

It is an arithmetic number, because the mean of its divisors is an integer number (160331622).

Almost surely, 2^320663243 is an apocalyptic number.

320663243 is a deficient number, since it is larger than the sum of its proper divisors (1).

320663243 is an equidigital number, since it uses as much as digits as its factorization.

320663243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 29.

The square root of 320663243 is about 17907.0724296296. The cubic root of 320663243 is about 684.4626065592.

The spelling of 320663243 in words is "three hundred twenty million, six hundred sixty-three thousand, two hundred forty-three".