320228999 has 2 divisors, whose sum is σ = 320229000. Its totient is φ = 320228998.

The previous prime is 320228971. The next prime is 320229011. The reversal of 320228999 is 999822023.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 320228999 - 2⁸ = 320228743 is a prime.

It is a super-2 number, since 2×320228999² = 205093223601084002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320228959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160114499 + 160114500.

It is an arithmetic number, because the mean of its divisors is an integer number (160114500).

Almost surely, 2^320228999 is an apocalyptic number.

320228999 is a deficient number, since it is larger than the sum of its proper divisors (1).

320228999 is an equidigital number, since it uses as much as digits as its factorization.

320228999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 320228999 is about 17894.9433919194. The cubic root of 320228999 is about 684.1534992584.

The spelling of 320228999 in words is "three hundred twenty million, two hundred twenty-eight thousand, nine hundred ninety-nine".