491942663 has 2 divisors, whose sum is σ = 491942664. Its totient is φ = 491942662.

The previous prime is 491942629. The next prime is 491942669. The reversal of 491942663 is 366249194.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491942663 - 2¹² = 491938567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491942669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245971331 + 245971332.

It is an arithmetic number, because the mean of its divisors is an integer number (245971332).

Almost surely, 2^491942663 is an apocalyptic number.

491942663 is a deficient number, since it is larger than the sum of its proper divisors (1).

491942663 is an equidigital number, since it uses as much as digits as its factorization.

491942663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 44.

The square root of 491942663 is about 22179.7804993647. The cubic root of 491942663 is about 789.4140091749.

The spelling of 491942663 in words is "four hundred ninety-one million, nine hundred forty-two thousand, six hundred sixty-three".