320772281 has 2 divisors, whose sum is σ = 320772282. Its totient is φ = 320772280.

The previous prime is 320772259. The next prime is 320772289. The reversal of 320772281 is 182277023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320732281 + 40000 = 17909^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 320772281 - 2¹⁸ = 320510137 is a prime.

It is a super-2 number, since 2×320772281² = 205789712515885922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (320772289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160386140 + 160386141.

It is an arithmetic number, because the mean of its divisors is an integer number (160386141).

Almost surely, 2^320772281 is an apocalyptic number.

It is an amenable number.

320772281 is a deficient number, since it is larger than the sum of its proper divisors (1).

320772281 is an equidigital number, since it uses as much as digits as its factorization.

320772281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 320772281 is about 17910.1167221210. The cubic root of 320772281 is about 684.5401790880.

The spelling of 320772281 in words is "three hundred twenty million, seven hundred seventy-two thousand, two hundred eighty-one".