200000491 has 2 divisors, whose sum is σ = 200000492. Its totient is φ = 200000490.

The previous prime is 200000483. The next prime is 200000513. The reversal of 200000491 is 194000002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 200000491 - 2³ = 200000483 is a prime.

It is not a weakly prime, because it can be changed into another prime (200000431) 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, 100000245 + 100000246.

It is an arithmetic number, because the mean of its divisors is an integer number (100000246).

Almost surely, 2^200000491 is an apocalyptic number.

200000491 is a deficient number, since it is larger than the sum of its proper divisors (1).

200000491 is an equidigital number, since it uses as much as digits as its factorization.

200000491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 200000491 is about 14142.1529831918. The cubic root of 200000491 is about 584.8040262064.

Adding to 200000491 its reverse (194000002), we get a palindrome (394000493).

The spelling of 200000491 in words is "two hundred million, four hundred ninety-one", and thus it is an aban number.