209774085979 has 2 divisors, whose sum is σ = 209774085980. Its totient is φ = 209774085978.

The previous prime is 209774085947. The next prime is 209774086001. The reversal of 209774085979 is 979580477902.

209774085979 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 209774085979 - 2⁵ = 209774085947 is a prime.

It is not a weakly prime, because it can be changed into another prime (209774055979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104887042989 + 104887042990.

It is an arithmetic number, because the mean of its divisors is an integer number (104887042990).

Almost surely, 2^209774085979 is an apocalyptic number.

209774085979 is a deficient number, since it is larger than the sum of its proper divisors (1).

209774085979 is an equidigital number, since it uses as much as digits as its factorization.

209774085979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80015040, while the sum is 67.

The spelling of 209774085979 in words is "two hundred nine billion, seven hundred seventy-four million, eighty-five thousand, nine hundred seventy-nine".