999901117 has 2 divisors, whose sum is σ = 999901118. Its totient is φ = 999901116.

The previous prime is 999901109. The next prime is 999901139. The reversal of 999901117 is 711109999.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 928177156 + 71723961 = 30466^2 + 8469^2 .

It is a cyclic number.

It is not a de Polignac number, because 999901117 - 2³ = 999901109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999901417) 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, 499950558 + 499950559.

It is an arithmetic number, because the mean of its divisors is an integer number (499950559).

Almost surely, 2^999901117 is an apocalyptic number.

It is an amenable number.

999901117 is a deficient number, since it is larger than the sum of its proper divisors (1).

999901117 is an equidigital number, since it uses as much as digits as its factorization.

999901117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45927, while the sum is 46.

The square root of 999901117 is about 31621.2130855222. The cubic root of 999901117 is about 999.9670379135.

The spelling of 999901117 in words is "nine hundred ninety-nine million, nine hundred one thousand, one hundred seventeen".