491524991 has 2 divisors, whose sum is σ = 491524992. Its totient is φ = 491524990.

The previous prime is 491524949. The next prime is 491525011. The reversal of 491524991 is 199425194.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491524991 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (451524991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245762495 + 245762496.

It is an arithmetic number, because the mean of its divisors is an integer number (245762496).

Almost surely, 2^491524991 is an apocalyptic number.

491524991 is a deficient number, since it is larger than the sum of its proper divisors (1).

491524991 is an equidigital number, since it uses as much as digits as its factorization.

491524991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 44.

The square root of 491524991 is about 22170.3628973456. The cubic root of 491524991 is about 789.1905349713.

The spelling of 491524991 in words is "four hundred ninety-one million, five hundred twenty-four thousand, nine hundred ninety-one".