999318553 has 2 divisors, whose sum is σ = 999318554. Its totient is φ = 999318552.

The previous prime is 999318521. The next prime is 999318571. The reversal of 999318553 is 355813999.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 999318544 + 9 = 31612^2 + 3^2 .

It is an emirp because it is prime and its reverse (355813999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999318553 - 2⁵ = 999318521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999318553.

It is not a weakly prime, because it can be changed into another prime (999318583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499659276 + 499659277.

It is an arithmetic number, because the mean of its divisors is an integer number (499659277).

Almost surely, 2^999318553 is an apocalyptic number.

It is an amenable number.

999318553 is a deficient number, since it is larger than the sum of its proper divisors (1).

999318553 is an equidigital number, since it uses as much as digits as its factorization.

999318553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1312200, while the sum is 52.

The square root of 999318553 is about 31612.0001423510. Note that the first 3 decimals coincide. The cubic root of 999318553 is about 999.7727993838.

The spelling of 999318553 in words is "nine hundred ninety-nine million, three hundred eighteen thousand, five hundred fifty-three".