999000493 has 2 divisors, whose sum is σ = 999000494.
Its totient is φ = 999000492.
The previous prime is 999000491. The next prime is 999000517. The reversal of 999000493 is 394000999.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 875390569 + 123609924 = 29587^2 + 11118^2
It is a cyclic number.
It is not a de Polignac number, because 999000493 - 21 = 999000491 is a prime.
Together with 999000491, it forms a pair of twin primes.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (999000491) 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, 499500246 + 499500247.
It is an arithmetic number, because the mean of its divisors is an integer number (499500247).
Almost surely, 2999000493 is an apocalyptic number.
It is an amenable number.
999000493 is a deficient number, since it is larger than the sum of its proper divisors (1).
999000493 is an equidigital number, since it uses as much as digits as its factorization.
999000493 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 78732, while the sum is 43.
The square root of 999000493 is about 31606.9690574721.
The cubic root of 999000493 is about 999.6667199367.
Note that the first 3 decimals are identical.
The spelling of 999000493 in words is "nine hundred ninety-nine million, four hundred ninety-three", and thus it is an aban number.