263317321 has 2 divisors, whose sum is σ = 263317322. Its totient is φ = 263317320.

The previous prime is 263317319. The next prime is 263317343. The reversal of 263317321 is 123713362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139240000 + 124077321 = 11800^2 + 11139^2 .

It is a cyclic number.

It is not a de Polignac number, because 263317321 - 2¹ = 263317319 is a prime.

Together with 263317319, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 263317321.

It is not a weakly prime, because it can be changed into another prime (263317381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131658660 + 131658661.

It is an arithmetic number, because the mean of its divisors is an integer number (131658661).

Almost surely, 2^263317321 is an apocalyptic number.

It is an amenable number.

263317321 is a deficient number, since it is larger than the sum of its proper divisors (1).

263317321 is an equidigital number, since it uses as much as digits as its factorization.

263317321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 28.

The square root of 263317321 is about 16227.0552165203. The cubic root of 263317321 is about 640.9534300114.

The spelling of 263317321 in words is "two hundred sixty-three million, three hundred seventeen thousand, three hundred twenty-one".