491731963 has 2 divisors, whose sum is σ = 491731964. Its totient is φ = 491731962.

The previous prime is 491731943. The next prime is 491731969. The reversal of 491731963 is 369137194.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491731963 is a prime.

It is not a weakly prime, because it can be changed into another prime (491731969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245865981 + 245865982.

It is an arithmetic number, because the mean of its divisors is an integer number (245865982).

Almost surely, 2^491731963 is an apocalyptic number.

491731963 is a deficient number, since it is larger than the sum of its proper divisors (1).

491731963 is an equidigital number, since it uses as much as digits as its factorization.

491731963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 43.

The square root of 491731963 is about 22175.0301690888. The cubic root of 491731963 is about 789.3012905620.

The spelling of 491731963 in words is "four hundred ninety-one million, seven hundred thirty-one thousand, nine hundred sixty-three".