500000491 has 2 divisors, whose sum is σ = 500000492. Its totient is φ = 500000490.

The previous prime is 500000489. The next prime is 500000507. The reversal of 500000491 is 194000005.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 500000491 - 2¹ = 500000489 is a prime.

Together with 500000489, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (500000461) 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, 250000245 + 250000246.

It is an arithmetic number, because the mean of its divisors is an integer number (250000246).

Almost surely, 2^500000491 is an apocalyptic number.

500000491 is a deficient number, since it is larger than the sum of its proper divisors (1).

500000491 is an equidigital number, since it uses as much as digits as its factorization.

500000491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 500000491 is about 22360.6907540890. The cubic root of 500000491 is about 793.7007857887.

Adding to 500000491 its reverse (194000005), we get a palindrome (694000496).

The spelling of 500000491 in words is "five hundred million, four hundred ninety-one", and thus it is an aban number.