999905117 has 2 divisors, whose sum is σ = 999905118. Its totient is φ = 999905116.

The previous prime is 999905113. The next prime is 999905147. The reversal of 999905117 is 711509999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 526886116 + 473019001 = 22954^2 + 21749^2 .

It is a cyclic number.

It is not a de Polignac number, because 999905117 - 2² = 999905113 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999905111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499952558 + 499952559.

It is an arithmetic number, because the mean of its divisors is an integer number (499952559).

Almost surely, 2^999905117 is an apocalyptic number.

It is an amenable number.

999905117 is a deficient number, since it is larger than the sum of its proper divisors (1).

999905117 is an equidigital number, since it uses as much as digits as its factorization.

999905117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 229635, while the sum is 50.

The square root of 999905117 is about 31621.2763341393. The cubic root of 999905117 is about 999.9683713330.

The spelling of 999905117 in words is "nine hundred ninety-nine million, nine hundred five thousand, one hundred seventeen".