99799789 has 2 divisors, whose sum is σ = 99799790. Its totient is φ = 99799788.

The previous prime is 99799771. The next prime is 99799813. The reversal of 99799789 is 98799799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76422564 + 23377225 = 8742^2 + 4835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99799789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99799709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49899894 + 49899895.

It is an arithmetic number, because the mean of its divisors is an integer number (49899895).

Almost surely, 2^99799789 is an apocalyptic number.

It is an amenable number.

99799789 is a deficient number, since it is larger than the sum of its proper divisors (1).

99799789 is an equidigital number, since it uses as much as digits as its factorization.

99799789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23147208, while the sum is 67.

The square root of 99799789 is about 9989.9844344223. The cubic root of 99799789 is about 463.8489106887.

The spelling of 99799789 in words is "ninety-nine million, seven hundred ninety-nine thousand, seven hundred eighty-nine".