999917969 has 2 divisors, whose sum is σ = 999917970. Its totient is φ = 999917968.

The previous prime is 999917953. The next prime is 999917977. The reversal of 999917969 is 969719999.

999917969 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., 959760400 + 40157569 = 30980^2 + 6337^2 .

It is a cyclic number.

It is not a de Polignac number, because 999917969 - 2⁴ = 999917953 is a prime.

It is a super-2 number, since 2×999917969² = 1999671889458169922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 999917899 and 999917908.

It is not a weakly prime, because it can be changed into another prime (999917929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499958984 + 499958985.

It is an arithmetic number, because the mean of its divisors is an integer number (499958985).

Almost surely, 2^999917969 is an apocalyptic number.

It is an amenable number.

999917969 is a deficient number, since it is larger than the sum of its proper divisors (1).

999917969 is an equidigital number, since it uses as much as digits as its factorization.

999917969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22320522, while the sum is 68.

The square root of 999917969 is about 31621.4795510900. The cubic root of 999917969 is about 999.9726555856.

The spelling of 999917969 in words is "nine hundred ninety-nine million, nine hundred seventeen thousand, nine hundred sixty-nine".