491225263 has 2 divisors, whose sum is σ = 491225264. Its totient is φ = 491225262.

The previous prime is 491225261. The next prime is 491225299. The reversal of 491225263 is 362522194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491225263 - 2¹ = 491225261 is a prime.

Together with 491225261, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491225261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245612631 + 245612632.

It is an arithmetic number, because the mean of its divisors is an integer number (245612632).

Almost surely, 2^491225263 is an apocalyptic number.

491225263 is a deficient number, since it is larger than the sum of its proper divisors (1).

491225263 is an equidigital number, since it uses as much as digits as its factorization.

491225263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 34.

The square root of 491225263 is about 22163.6022117344. The cubic root of 491225263 is about 789.0300883328.

The spelling of 491225263 in words is "four hundred ninety-one million, two hundred twenty-five thousand, two hundred sixty-three".