499991801 has 2 divisors, whose sum is σ = 499991802. Its totient is φ = 499991800.

The previous prime is 499991773. The next prime is 499991803. The reversal of 499991801 is 108199994.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 499969600 + 22201 = 22360^2 + 149^2 .

It is a cyclic number.

It is not a de Polignac number, because 499991801 - 2²⁶ = 432882937 is a prime.

It is a Sophie Germain prime.

Together with 499991803, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 499991801.

It is not a weakly prime, because it can be changed into another prime (499991803) 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, 249995900 + 249995901.

It is an arithmetic number, because the mean of its divisors is an integer number (249995901).

Almost surely, 2^499991801 is an apocalyptic number.

It is an amenable number.

499991801 is a deficient number, since it is larger than the sum of its proper divisors (1).

499991801 is an equidigital number, since it uses as much as digits as its factorization.

499991801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 50.

The square root of 499991801 is about 22360.4964390328. The cubic root of 499991801 is about 793.6961875933.

The spelling of 499991801 in words is "four hundred ninety-nine million, nine hundred ninety-one thousand, eight hundred one".