491945963 has 2 divisors, whose sum is σ = 491945964. Its totient is φ = 491945962.

The previous prime is 491945941. The next prime is 491945977. The reversal of 491945963 is 369549194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491945963 - 2¹⁴ = 491929579 is a prime.

It is not a weakly prime, because it can be changed into another prime (491945063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245972981 + 245972982.

It is an arithmetic number, because the mean of its divisors is an integer number (245972982).

Almost surely, 2^491945963 is an apocalyptic number.

491945963 is a deficient number, since it is larger than the sum of its proper divisors (1).

491945963 is an equidigital number, since it uses as much as digits as its factorization.

491945963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 50.

The square root of 491945963 is about 22179.8548913197. The cubic root of 491945963 is about 789.4157743267.

The spelling of 491945963 in words is "four hundred ninety-one million, nine hundred forty-five thousand, nine hundred sixty-three".