263347321 has 2 divisors, whose sum is σ = 263347322. Its totient is φ = 263347320.

The previous prime is 263347313. The next prime is 263347333. The reversal of 263347321 is 123743362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254562025 + 8785296 = 15955^2 + 2964^2 .

It is a cyclic number.

It is not a de Polignac number, because 263347321 - 2³ = 263347313 is a prime.

It is a super-2 number, since 2×263347321² = 138703622955754082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (263347121) 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, 131673660 + 131673661.

It is an arithmetic number, because the mean of its divisors is an integer number (131673661).

Almost surely, 2^263347321 is an apocalyptic number.

It is an amenable number.

263347321 is a deficient number, since it is larger than the sum of its proper divisors (1).

263347321 is an equidigital number, since it uses as much as digits as its factorization.

263347321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 31.

The square root of 263347321 is about 16227.9795723312. The cubic root of 263347321 is about 640.9777705709.

The spelling of 263347321 in words is "two hundred sixty-three million, three hundred forty-seven thousand, three hundred twenty-one".