99816779 has 2 divisors, whose sum is σ = 99816780. Its totient is φ = 99816778.

The previous prime is 99816733. The next prime is 99816797. The reversal of 99816779 is 97761899.

Together with next prime (99816797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99816779 - 2¹² = 99812683 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99819779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49908389 + 49908390.

It is an arithmetic number, because the mean of its divisors is an integer number (49908390).

Almost surely, 2^99816779 is an apocalyptic number.

99816779 is a deficient number, since it is larger than the sum of its proper divisors (1).

99816779 is an equidigital number, since it uses as much as digits as its factorization.

99816779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 56.

The square root of 99816779 is about 9990.8347499095. The cubic root of 99816779 is about 463.8752312047.

The spelling of 99816779 in words is "ninety-nine million, eight hundred sixteen thousand, seven hundred seventy-nine".