999318493 has 2 divisors, whose sum is σ = 999318494. Its totient is φ = 999318492.

The previous prime is 999318491. The next prime is 999318521. The reversal of 999318493 is 394813999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 909504964 + 89813529 = 30158^2 + 9477^2 .

It is a cyclic number.

It is not a de Polignac number, because 999318493 - 2¹ = 999318491 is a prime.

Together with 999318491, 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 (999318491) 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, 499659246 + 499659247.

It is an arithmetic number, because the mean of its divisors is an integer number (499659247).

Almost surely, 2^999318493 is an apocalyptic number.

It is an amenable number.

999318493 is a deficient number, since it is larger than the sum of its proper divisors (1).

999318493 is an equidigital number, since it uses as much as digits as its factorization.

999318493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1889568, while the sum is 55.

The square root of 999318493 is about 31611.9991933443. Note that the first 3 decimals coincide. The cubic root of 999318493 is about 999.7727793747.

The spelling of 999318493 in words is "nine hundred ninety-nine million, three hundred eighteen thousand, four hundred ninety-three".