263396321 has 2 divisors, whose sum is σ = 263396322. Its totient is φ = 263396320.

The previous prime is 263396293. The next prime is 263396323. The reversal of 263396321 is 123693362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194323600 + 69072721 = 13940^2 + 8311^2 .

It is a cyclic number.

It is not a de Polignac number, because 263396321 - 2⁶ = 263396257 is a prime.

Together with 263396323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (263396323) 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, 131698160 + 131698161.

It is an arithmetic number, because the mean of its divisors is an integer number (131698161).

Almost surely, 2^263396321 is an apocalyptic number.

It is an amenable number.

263396321 is a deficient number, since it is larger than the sum of its proper divisors (1).

263396321 is an equidigital number, since it uses as much as digits as its factorization.

263396321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 35.

The square root of 263396321 is about 16229.4892402688. The cubic root of 263396321 is about 641.0175228428.

The spelling of 263396321 in words is "two hundred sixty-three million, three hundred ninety-six thousand, three hundred twenty-one".