999917669 has 2 divisors, whose sum is σ = 999917670. Its totient is φ = 999917668.

The previous prime is 999917623. The next prime is 999917671. The reversal of 999917669 is 966719999.

999917669 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., 938687044 + 61230625 = 30638^2 + 7825^2 .

It is a cyclic number.

It is not a de Polignac number, because 999917669 - 2¹² = 999913573 is a prime.

It is a super-2 number, since 2×999917669² = 1999670689556787122, which contains 22 as substring.

Together with 999917671, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999917969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499958834 + 499958835.

It is an arithmetic number, because the mean of its divisors is an integer number (499958835).

Almost surely, 2^999917669 is an apocalyptic number.

It is an amenable number.

999917669 is a deficient number, since it is larger than the sum of its proper divisors (1).

999917669 is an equidigital number, since it uses as much as digits as its factorization.

999917669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14880348, while the sum is 65.

The square root of 999917669 is about 31621.4748074785. The cubic root of 999917669 is about 999.9725555801.

The spelling of 999917669 in words is "nine hundred ninety-nine million, nine hundred seventeen thousand, six hundred sixty-nine".