491899 has 2 divisors, whose sum is σ = 491900. Its totient is φ = 491898.

The previous prime is 491873. The next prime is 491923. The reversal of 491899 is 998194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491899 - 2⁵ = 491867 is a prime.

It is a zygodrome in base 5.

It is not a weakly prime, because it can be changed into another prime (491819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245949 + 245950.

It is an arithmetic number, because the mean of its divisors is an integer number (245950).

2⁴⁹¹⁸⁹⁹ is an apocalyptic number.

491899 is a deficient number, since it is larger than the sum of its proper divisors (1).

491899 is an equidigital number, since it uses as much as digits as its factorization.

491899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 40.

The square root of 491899 is about 701.3551168987. The cubic root of 491899 is about 78.9390653334.

The spelling of 491899 in words is "four hundred ninety-one thousand, eight hundred ninety-nine".