999313121 has 2 divisors, whose sum is σ = 999313122. Its totient is φ = 999313120.

The previous prime is 999313103. The next prime is 999313129. The reversal of 999313121 is 121313999.

999313121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 811623121 + 187690000 = 28489^2 + 13700^2 .

It is an emirp because it is prime and its reverse (121313999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999313121 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_50814596 and since 999313121 and 50814596 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (999313129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499656560 + 499656561.

It is an arithmetic number, because the mean of its divisors is an integer number (499656561).

Almost surely, 2^999313121 is an apocalyptic number.

It is an amenable number.

999313121 is a deficient number, since it is larger than the sum of its proper divisors (1).

999313121 is an equidigital number, since it uses as much as digits as its factorization.

999313121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13122, while the sum is 38.

The square root of 999313121 is about 31611.9142254942. The cubic root of 999313121 is about 999.7709878908.

The spelling of 999313121 in words is "nine hundred ninety-nine million, three hundred thirteen thousand, one hundred twenty-one".