999906169 has 2 divisors, whose sum is σ = 999906170. Its totient is φ = 999906168.

The previous prime is 999906121. The next prime is 999906203. The reversal of 999906169 is 961609999.

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., 907515625 + 92390544 = 30125^2 + 9612^2 .

It is a cyclic number.

It is not a de Polignac number, because 999906169 - 2⁷ = 999906041 is a prime.

It is a super-2 number, since 2×999906169² = 1999624693608513122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999906569) 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, 499953084 + 499953085.

It is an arithmetic number, because the mean of its divisors is an integer number (499953085).

Almost surely, 2^999906169 is an apocalyptic number.

It is an amenable number.

999906169 is a deficient number, since it is larger than the sum of its proper divisors (1).

999906169 is an equidigital number, since it uses as much as digits as its factorization.

999906169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2125764, while the sum is 58.

The square root of 999906169 is about 31621.2929685046. The cubic root of 999906169 is about 999.9687220217.

The spelling of 999906169 in words is "nine hundred ninety-nine million, nine hundred six thousand, one hundred sixty-nine".