99996779 has 2 divisors, whose sum is σ = 99996780. Its totient is φ = 99996778.

The previous prime is 99996769. The next prime is 99996797. The reversal of 99996779 is 97769999.

Together with next prime (99996797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99996779 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99996719) 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, 49998389 + 49998390.

It is an arithmetic number, because the mean of its divisors is an integer number (49998390).

Almost surely, 2^99996779 is an apocalyptic number.

99996779 is a deficient number, since it is larger than the sum of its proper divisors (1).

99996779 is an equidigital number, since it uses as much as digits as its factorization.

99996779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17360406, while the sum is 65.

The square root of 99996779 is about 9999.8389487031. The cubic root of 99996779 is about 464.1538997886.

The spelling of 99996779 in words is "ninety-nine million, nine hundred ninety-six thousand, seven hundred seventy-nine".