99686789 has 2 divisors, whose sum is σ = 99686790. Its totient is φ = 99686788.

The previous prime is 99686767. The next prime is 99686801. The reversal of 99686789 is 98768699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68973025 + 30713764 = 8305^2 + 5542^2 .

It is a cyclic number.

It is not a de Polignac number, because 99686789 - 2²⁰ = 98638213 is a prime.

It is a super-2 number, since 2×99686789² = 19874911802261042, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99686089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49843394 + 49843395.

It is an arithmetic number, because the mean of its divisors is an integer number (49843395).

Almost surely, 2^99686789 is an apocalyptic number.

It is an amenable number.

99686789 is a deficient number, since it is larger than the sum of its proper divisors (1).

99686789 is an equidigital number, since it uses as much as digits as its factorization.

99686789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 62.

The square root of 99686789 is about 9984.3271681170. The cubic root of 99686789 is about 463.6737776467.

The spelling of 99686789 in words is "ninety-nine million, six hundred eighty-six thousand, seven hundred eighty-nine".