491229047 has 2 divisors, whose sum is σ = 491229048. Its totient is φ = 491229046.

The previous prime is 491229043. The next prime is 491229071. The reversal of 491229047 is 740922194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491229047 - 2² = 491229043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491229047.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491229043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245614523 + 245614524.

It is an arithmetic number, because the mean of its divisors is an integer number (245614524).

Almost surely, 2^491229047 is an apocalyptic number.

491229047 is a deficient number, since it is larger than the sum of its proper divisors (1).

491229047 is an equidigital number, since it uses as much as digits as its factorization.

491229047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 491229047 is about 22163.6875767549. The cubic root of 491229047 is about 789.0321143430.

The spelling of 491229047 in words is "four hundred ninety-one million, two hundred twenty-nine thousand, forty-seven".