320216761 has 2 divisors, whose sum is σ = 320216762. Its totient is φ = 320216760.

The previous prime is 320216719. The next prime is 320216773. The reversal of 320216761 is 167612023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205062400 + 115154361 = 14320^2 + 10731^2 .

It is a cyclic number.

It is not a de Polignac number, because 320216761 - 2¹³ = 320208569 is a prime.

It is a super-2 number, since 2×320216761² = 205077548050662242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (320216711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160108380 + 160108381.

It is an arithmetic number, because the mean of its divisors is an integer number (160108381).

Almost surely, 2^320216761 is an apocalyptic number.

It is an amenable number.

320216761 is a deficient number, since it is larger than the sum of its proper divisors (1).

320216761 is an equidigital number, since it uses as much as digits as its factorization.

320216761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 320216761 is about 17894.6014484816. The cubic root of 320216761 is about 684.1447838524.

Adding to 320216761 its reverse (167612023), we get a palindrome (487828784).

The spelling of 320216761 in words is "three hundred twenty million, two hundred sixteen thousand, seven hundred sixty-one".