263998489 has 2 divisors, whose sum is σ = 263998490. Its totient is φ = 263998488.

The previous prime is 263998477. The next prime is 263998517. The reversal of 263998489 is 984899362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 247024089 + 16974400 = 15717^2 + 4120^2 .

It is a cyclic number.

It is not a de Polignac number, because 263998489 - 2¹¹ = 263996441 is a prime.

It is not a weakly prime, because it can be changed into another prime (263998409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131999244 + 131999245.

It is an arithmetic number, because the mean of its divisors is an integer number (131999245).

Almost surely, 2^263998489 is an apocalyptic number.

It is an amenable number.

263998489 is a deficient number, since it is larger than the sum of its proper divisors (1).

263998489 is an equidigital number, since it uses as much as digits as its factorization.

263998489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6718464, while the sum is 58.

The square root of 263998489 is about 16248.0303113947. The cubic root of 263998489 is about 641.5056421119.

The spelling of 263998489 in words is "two hundred sixty-three million, nine hundred ninety-eight thousand, four hundred eighty-nine".