493813 has 2 divisors, whose sum is σ = 493814.
Its totient is φ = 493812.
The previous prime is 493811. The next prime is 493817. The reversal of 493813 is 318394.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 386884 + 106929 = 622^2 + 327^2
It is a cyclic number.
It is not a de Polignac number, because 493813 - 21 = 493811 is a prime.
Together with 493811, 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 (493811) 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, 246906 + 246907.
It is an arithmetic number, because the mean of its divisors is an integer number (246907).
493813 is a Friedman number, since it can be written as 9*(38^3-4)+1, using all its digits and the basic arithmetic operations.
2493813 is an apocalyptic number.
It is an amenable number.
493813 is a deficient number, since it is larger than the sum of its proper divisors (1).
493813 is an equidigital number, since it uses as much as digits as its factorization.
493813 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 2592, while the sum is 28.
The square root of 493813 is about 702.7182934861.
The cubic root of 493813 is about 79.0413179154.
The spelling of 493813 in words is "four hundred ninety-three thousand, eight hundred thirteen".