998709779 has 2 divisors, whose sum is σ = 998709780. Its totient is φ = 998709778.

The previous prime is 998709773. The next prime is 998709781. The reversal of 998709779 is 977907899.

998709779 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 is a cyclic number.

It is not a de Polignac number, because 998709779 - 2²⁸ = 730274323 is a prime.

Together with 998709781, it forms a pair of twin primes.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 998709779 parts by 44692 straight cuts.

It is not a weakly prime, because it can be changed into another prime (998709773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499354889 + 499354890.

It is an arithmetic number, because the mean of its divisors is an integer number (499354890).

Almost surely, 2^998709779 is an apocalyptic number.

998709779 is a deficient number, since it is larger than the sum of its proper divisors (1).

998709779 is an equidigital number, since it uses as much as digits as its factorization.

998709779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18003384, while the sum is 65.

The square root of 998709779 is about 31602.3698320237. The cubic root of 998709779 is about 999.5697412373.

The spelling of 998709779 in words is "nine hundred ninety-eight million, seven hundred nine thousand, seven hundred seventy-nine".