320966257 has 2 divisors, whose sum is σ = 320966258. Its totient is φ = 320966256.

The previous prime is 320966249. The next prime is 320966263. The reversal of 320966257 is 752669023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 252142641 + 68823616 = 15879^2 + 8296^2 .

It is an emirp because it is prime and its reverse (752669023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320966257 - 2³ = 320966249 is a prime.

It is not a weakly prime, because it can be changed into another prime (320966207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160483128 + 160483129.

It is an arithmetic number, because the mean of its divisors is an integer number (160483129).

Almost surely, 2^320966257 is an apocalyptic number.

It is an amenable number.

320966257 is a deficient number, since it is larger than the sum of its proper divisors (1).

320966257 is an equidigital number, since it uses as much as digits as its factorization.

320966257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 320966257 is about 17915.5311671187. The cubic root of 320966257 is about 684.6781353237.

The spelling of 320966257 in words is "three hundred twenty million, nine hundred sixty-six thousand, two hundred fifty-seven".