999603313 has 2 divisors, whose sum is σ = 999603314. Its totient is φ = 999603312.

The previous prime is 999603301. The next prime is 999603331. The reversal of 999603313 is 313306999.

Together with next prime (999603331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 565631089 + 433972224 = 23783^2 + 20832^2 .

It is an emirp because it is prime and its reverse (313306999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999603313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999603313.

It is not a weakly prime, because it can be changed into another prime (999603613) 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, 499801656 + 499801657.

It is an arithmetic number, because the mean of its divisors is an integer number (499801657).

Almost surely, 2^999603313 is an apocalyptic number.

It is an amenable number.

999603313 is a deficient number, since it is larger than the sum of its proper divisors (1).

999603313 is an equidigital number, since it uses as much as digits as its factorization.

999603313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 118098, while the sum is 43.

The square root of 999603313 is about 31616.5038073472. The cubic root of 999603313 is about 999.8677535116.

The spelling of 999603313 in words is "nine hundred ninety-nine million, six hundred three thousand, three hundred thirteen".