320216773 has 2 divisors, whose sum is σ = 320216774. Its totient is φ = 320216772.

The previous prime is 320216761. The next prime is 320216779. The reversal of 320216773 is 377612023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 266897569 + 53319204 = 16337^2 + 7302^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320216773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320216779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160108386 + 160108387.

It is an arithmetic number, because the mean of its divisors is an integer number (160108387).

Almost surely, 2^320216773 is an apocalyptic number.

It is an amenable number.

320216773 is a deficient number, since it is larger than the sum of its proper divisors (1).

320216773 is an equidigital number, since it uses as much as digits as its factorization.

320216773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 31.

The square root of 320216773 is about 17894.6017837783. The cubic root of 320216773 is about 684.1447923985.

Adding to 320216773 its reverse (377612023), we get a palindrome (697828796).

The spelling of 320216773 in words is "three hundred twenty million, two hundred sixteen thousand, seven hundred seventy-three".