320900243 has 2 divisors, whose sum is σ = 320900244. Its totient is φ = 320900242.

The previous prime is 320900231. The next prime is 320900249. The reversal of 320900243 is 342009023.

It is a strong prime.

It is an emirp because it is prime and its reverse (342009023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320900243 - 2⁴ = 320900227 is a prime.

It is not a weakly prime, because it can be changed into another prime (320900249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160450121 + 160450122.

It is an arithmetic number, because the mean of its divisors is an integer number (160450122).

Almost surely, 2^320900243 is an apocalyptic number.

320900243 is a deficient number, since it is larger than the sum of its proper divisors (1).

320900243 is an equidigital number, since it uses as much as digits as its factorization.

320900243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 320900243 is about 17913.6887044517. The cubic root of 320900243 is about 684.6311922360.

Adding to 320900243 its reverse (342009023), we get a palindrome (662909266).

The spelling of 320900243 in words is "three hundred twenty million, nine hundred thousand, two hundred forty-three".